Replaced Oil Pressure Sensor and still have the P0520 code being shown?

Thank you! I don't think we have anything to check for voltage, but if changing the wiring is easy enough to do, we might be able to just try changing that out. The wires all look good from the outside and we re positioned them as well as making sure everything was tight and secure. There is oil in the engine and we check all the fluids every week to make sure everything looks good. Thank you! I don't think we have anything to check for voltage, but if changing the wiring is easy enough to do, we might be able to just try changing that out. The wires all look good from the outside and we re positioned them as well as making sure everything was tight and secure. There is oil in the engine and we check all the fluids every week to make sure everything looks good.

Ok I know this motor well and it is starting to sound like the trigger coil that is behind the harmonic balancer on the crankshaft. This is why the car would just quit and not restart. This is a common problem with this motor. Without doing the test that I mentioned I can’t say much more. Could check the connection to the computer (the plug) the computer should be buried under the air box. Ok I know this motor well and it is starting to sound like the trigger coil that is behind the harmonic balancer on the crankshaft. This is why the car would just quit and not restart. This is a common problem with this motor. Without doing the test that I mentioned I can’t say much more. Could check the connection to the computer (the plug) the computer should be buried under the air box.

Are you talking about the actual crankshaft position sensor? That's what we are currently working on changing at the moment we are just waiting for the part which we should have by this afternoon. Are you talking about the actual crankshaft position sensor? That's what we are currently working on changing at the moment we are just waiting for the part which we should have by this afternoon.

Yes that is it. Yes that is it.

Ok perfect! Once we have the part installed I'll give you an update on if the vehicle starts or not. Thank you! Ok perfect! Once we have the part installed I'll give you an update on if the vehicle starts or not. Thank you!

Ok replaced the crankshaft sensor and still no start. Ok replaced the crankshaft sensor and still no start.

I am with you now ! Ok two things . First did you check for spark at all here ? Second it was being driven and just stopped! How long had it been running or did you just do something like fill the tank ? / drive through a big puddle? Anything different happen ? The spark will tell us that the computer is doing what it should be. This is starting to look like the computer. So we need to do some simple tests. First is the spark test then if we have spark then we can throw some fuel into the intaake a splash of gas or quick start / either and see if it fires up on it. I am with you now ! Ok two things . First did you check for spark at all here ? Second it was being driven and just stopped! How long had it been running or did you just do something like fill the tank ? / drive through a big puddle? Anything different happen ? The spark will tell us that the computer is doing what it should be. This is starting to look like the computer. So we need to do some simple tests. First is the spark test then if we have spark then we can throw some fuel into the intaake a splash of gas or quick start / either and see if it fires up on it.

We will check to see if there is any sort of spark first thing tomorrow morning! The car had only been running for about 5 minutes when it stalled but had been driven a half hour that same morning. So there was about 8 hours in between the morning drive and the afternoon drive where the car stalled after 5 minutes. No puddles and the gas tank had not been filled since Sunday (the car stalled on Tuesday) and we only ever use Shell gas. We also already tried some quick start in the intake and the car still wouldn't start! We will check to see if there is any sort of spark first thing tomorrow morning! The car had only been running for about 5 minutes when it stalled but had been driven a half hour that same morning. So there was about 8 hours in between the morning drive and the afternoon drive where the car stalled after 5 minutes. No puddles and the gas tank had not been filled since Sunday (the car stalled on Tuesday) and we only ever use Shell gas. We also already tried some quick start in the intake and the car still wouldn't start!

Well if you tried the quick start and it didn’t fire we are going to find that there is no spark. But I still want you to check. Well if you tried the quick start and it didn’t fire we are going to find that there is no spark. But I still want you to check.

Ok no spark but in the meantime, my dad is going to change out the ignition module and see if that does anything. Sounds like you might be leaning more towards the PCM as the issue though! Ok no spark but in the meantime, my dad is going to change out the ignition module and see if that does anything. Sounds like you might be leaning more towards the PCM as the issue though!

Well there is no ignition module on it just three coils and they can’t fail all at once. You would loose spark on two cylinders Well there is no ignition module on it just three coils and they can’t fail all at once. You would loose spark on two cylinders

Now I would tell you to change the crank sensor but you already did that. So now it leaves the wiring and the computer. I have spare computers but I can’t get one to you. Make sure all the fuses in the fuse box are good double check them. Get one of those fuse checkers. You just push it on top of the fuse and the light lights up. Now I would tell you to change the crank sensor but you already did that. So now it leaves the wiring and the computer. I have spare computers but I can’t get one to you. Make sure all the fuses in the fuse box are good double check them. Get one of those fuse checkers. You just push it on top of the fuse and the light lights up.

We have another vehicle that is out of commission that shares many of the same parts so we are swapping out fuses with that one just to be sure. I think we will try to get another PCM today and give that a shot! We have another vehicle that is out of commission that shares many of the same parts so we are swapping out fuses with that one just to be sure. I think we will try to get another PCM today and give that a shot!

Ok finally got our new PCM that has been programmed for our vehicle and sent to us. We installed it today and absolutely CANNOT get the key to be programmed. We have what we think to be two PK Circle Plus keys and neither one will program. When we put the key into the ignition and turn it to the ON position, the security light will turn on (check engine light stays illuminated the whole time) and then turn off after a few seconds. We still tried to do the 10 minutes in ON and then turn the key off repeated 3 times but still no start. We also hear a clicking noise coming from somewhere in the dash when the key is in the ON position. I believe we did get the locks to click and the horn honked but no start. Any suggestions? Ok finally got our new PCM that has been programmed for our vehicle and sent to us. We installed it today and absolutely CANNOT get the key to be programmed. We have what we think to be two PK Circle Plus keys and neither one will program. When we put the key into the ignition and turn it to the ON position, the security light will turn on (check engine light stays illuminated the whole time) and then turn off after a few seconds. We still tried to do the 10 minutes in ON and then turn the key off repeated 3 times but still no start. We also hear a clicking noise coming from somewhere in the dash when the key is in the ON position. I believe we did get the locks to click and the horn honked but no start. Any suggestions?

I am not any help with that security thing you should have had it taken out when it was reprogrammed. I would ask the place where you got the computer from. You must not be paring the key right with the ecu. I am not any help with that security thing you should have had it taken out when it was reprogrammed. I would ask the place where you got the computer from. You must not be paring the key right with the ecu.

We did it by the PDF they gave us a few times and it still didn't pair. We did message them and they were no help. I figured I would just post something here in case! I was told by an "online mechanic" that we needed to take the car to a mechanic and get the "immobilizer" programmed but in all the research we had done that was never mentioned. Is that something you had to do for any of your vehicles? We did it by the PDF they gave us a few times and it still didn't pair. We did message them and they were no help. I figured I would just post something here in case! I was told by an "online mechanic" that we needed to take the car to a mechanic and get the "immobilizer" programmed but in all the research we had done that was never mentioned. Is that something you had to do for any of your vehicles?

You are going to need a scan tool for programming You are going to need a scan tool for programming

2008 Buick Lucerne V6-3.8L

Antitheft and Alarm Systems: Programming and Relearning
Immobilizer System Component Programming
10-Minute Immobilizer Relearn
This 10-minute relearn procedure will relearn the prerelease password and the challenge/response data between the theft deterrent module (TDM) and the engine control module (ECM).
1. Connect a scan tool to the vehicle in the pass-thru arrangement. 2. Turn ON the ignition, with the engine OFF. 3. Ensure that all power consuming devices are turned OFF on the vehicle. 4. On the Techline Terminal, select Service Programming System and follow the Techline Terminal on-screen instructions, using the Pass-Thru method. Ensure the correct programming selection is chosen based on component being replaced or programmed. For this procedure, go to the V.T.D. Vehicle Theft Deterrent Learn menu and choose the Vehicle Theft Deterrent Learn, ECM, or PK3 Replaced selection. 5. At this point the scan tool must remain connected for the duration of the 10-minute relearn procedure.
Important: * The scan tool will initially display 12 Minutes. The first 2 minutes allow the scan tool to initialize the appropriate control module. The remaining 10 minutes is the relearn timer.
* On some vehicles the security indicator may be illuminated for the duration of the 10-minute relearn procedure.
6. Observe the scan tool, after approximately 10 minutes the scan tool will display "Programming Successful, Turn OFF Ignition". The vehicle is now ready to relearn the key information and/or the passwords on the next ignition switch transition from OFF to CRANK. 7. Turn OFF the ignition and wait 2 minutes. 8. With a master vehicle key, turn the ignition to the RUN position for 15 seconds, then start the vehicle. The TDM and ECM have now relearned the pre-release password and the challenge/response data. 9. With a scan tool, clear any DTCs. 2008 Buick Lucerne V6-3.8L Antitheft and Alarm Systems: Programming and Relearning Immobilizer System Component Programming 10-Minute Immobilizer Relearn This 10-minute relearn procedure will relearn the prerelease password and the challenge/response data between the theft deterrent module (TDM) and the engine control module (ECM). 1. Connect a scan tool to the vehicle in the pass-thru arrangement. 2. Turn ON the ignition, with the engine OFF. 3. Ensure that all power consuming devices are turned OFF on the vehicle. 4. On the Techline Terminal, select Service Programming System and follow the Techline Terminal on-screen instructions, using the Pass-Thru method. Ensure the correct programming selection is chosen based on component being replaced or programmed. For this procedure, go to the V.T.D. Vehicle Theft Deterrent Learn menu and choose the Vehicle Theft Deterrent Learn, ECM, or PK3 Replaced selection. 5. At this point the scan tool must remain connected for the duration of the 10-minute relearn procedure. Important: * The scan tool will initially display 12 Minutes. The first 2 minutes allow the scan tool to initialize the appropriate control module. The remaining 10 minutes is the relearn timer. * On some vehicles the security indicator may be illuminated for the duration of the 10-minute relearn procedure. 6. Observe the scan tool, after approximately 10 minutes the scan tool will display "Programming Successful, Turn OFF Ignition". The vehicle is now ready to relearn the key information and/or the passwords on the next ignition switch transition from OFF to CRANK. 7. Turn OFF the ignition and wait 2 minutes. 8. With a master vehicle key, turn the ignition to the RUN position for 15 seconds, then start the vehicle. The TDM and ECM have now relearned the pre-release password and the challenge/response data. 9. With a scan tool, clear any DTCs.

Hopefully our scan tool can do this because if not I'm assuming this tool will be pretty expensive! Is this something you have to do for every new PCM? Hopefully our scan tool can do this because if not I'm assuming this tool will be pretty expensive! Is this something you have to do for every new PCM?

On newer cars you probably have too On newer cars you probably have too

Ok we will try to see if we can get that programmed tomorrow! You have been so helpful and I'm very thankful! This has turned into such a headache. Ok we will try to see if we can get that programmed tomorrow! You have been so helpful and I'm very thankful! This has turned into such a headache.

you could have bought one on eBay already program to you vin you could have bought one on eBay already program to you vin

https://www.ebay.com/itm/06-07-08-Lucern... https://www.ebay.com/itm/06-07-08-Lucerne-3-8L-ENGINE-COMPUTER-12600930-PROGRAMMED-TO-YOUR-VIN-PCM/202565580164?epid=657971496&hash=item2f29d97584&enc=AQADAAADEFjVrDbVsZ8oH%2F8PNHtt9VX4%2Fw7FZcmMuqsX8uaFEduVLjkEGZ70s98pCO65NeLuzlvV3WWbvmdDJAkdVuENLkKrWB8cIadK9Yvyf1ZTuupkm2Smc3XtWp6aWCAw72kcP7Jrklo8nXO2H6GBICkJbOenLc6aYHe6txu0vKG9xVcffd9yc6EDgVBjBoIJgVAtVOv8mQbh990Er%2Bnb2IaNtXzTJEiyYBHTj%2Fkpbf40iiP83Jsx0sI8V8otVEcgWw9%2FcPMK98U%2Bh%2FN%2BbdOWAPsLfoGo0hfQEqFu1j0oAzffUu%2BpnCY5p0KjKCklmkcdvpWg%2F%2B%2BN9apcj8HCh8oXh%2FJz0vlmoBl3wd6sXRX77gPBW46ZgqzfmO46GWOzQ6wqzLBqgrAttEucUd6v0wXtLZTCO%2Bs0Z5CWP7SCntnkfUjkiUMsd0UTHDX%2BYPBt0HFlMho4tvE1VwaYwHwbPRZIF4RgJjDgD2nMPO1LVMkvOniC24X0fD5c1gfRKGnFONdA2bdWnChiogwexO93s%2Bv%2BNbjKjOlyJfjsgGUNbOWEgCFe3MYJt%2FkRDyWld5k47c1j%2F1%2B5PMH%2BV5yRMVrupKsCwSV9DWmlOMK%2BH2K3r974Ok%2F57VOkDRwh3acBLSCcEHuPayY5IQBeOTLf8cw%2B8Pwt%2FR7v6GmcOIn1a3hHIi7TiFcT50g39Aa%2B13FjeiSf%2BM1kibXgKW73u78wO5lMRV9D%2BPxBH5C73Av%2BVCk8tTSap7RwodtJ3ASvgUKs8fjsOl6FG6UsPay%2Fc8POA75%2BkZwjvk8s6FtyylK%2F74W6iqdbylXAH5S233lfBnCoa2xYqfyMgcMg8Fga%2BtRfABLnVYDrWoxRgZMtltxhfKCBZ%2FvC12CltSEZPRQ874GTT%2FgqkWJB24EGIduXIXhpgoDaD1pf5wCRwoy9Cq7TaOpuCWPRxGIy%2FAlhpBXnbZyRV9DNytKfKGq7QHKswz97ho1iBOgXCArJjETFiBELp4ZlcowGExNQCAUwsXnRUz65GoDUZElsaDNpWGdpPvvWVaBQdCLjWaAnKuI%3D&checksum=202565580164f047a17815574be885acb1380055ba45

We did buy our PCM already programmed to our vehicle from ebay. People are now saying we have to have our immobilizer programmed too before we reprogram the key which that ebay store mentioned nothing about and that's where we are so far. We have our programmed PCM to our VIN and are trying to get the key to be reprogrammed to our new programmed PCM. We did buy our PCM already programmed to our vehicle from ebay. People are now saying we have to have our immobilizer programmed too before we reprogram the key which that ebay store mentioned nothing about and that's where we are so far. We have our programmed PCM to our VIN and are trying to get the key to be reprogrammed to our new programmed PCM.

OK back again. Finally got another PCM programmed for out VIN by O'Rielly and FINALLY was able to bypass the immobilizer. Still no spark and no start. The engine is turning over and trying to start but wont. We are going to try a new camshaft sensor tomorrow. So far, new oil pressure sensor, new PCM, new crankshaft and still no spark. I really hope this new camshaft will do it because I'm at my wits end! OK back again. Finally got another PCM programmed for out VIN by O'Rielly and FINALLY was able to bypass the immobilizer. Still no spark and no start. The engine is turning over and trying to start but wont. We are going to try a new camshaft sensor tomorrow. So far, new oil pressure sensor, new PCM, new crankshaft and still no spark. I really hope this new camshaft will do it because I'm at my wits end!

Unfortunately I was not driving, but my mom is pretty sure there were no warnings before the car just turned completely off. Unfortunately I was not driving, but my mom is pretty sure there were no warnings before the car just turned completely off.

did you erase the code after installing the sensor? did you erase the code after installing the sensor?

Yup! We erased it before every start attempt and it kept popping back up. Yup! We erased it before every start attempt and it kept popping back up.

Where is the oil pressure sensor location? Where is the oil pressure sensor location?

I don't think on this vehicle the oil pressure sensor will keep the engine from starting. I don't think on this vehicle the oil pressure sensor will keep the engine from starting.

Have you check to see if your fuel pump is turning on? Have you check to see if your fuel pump is turning on?

Check fuel pump for sound and see if the relay is clicking # 41 under hood relay box.

Check fuel pump for sound and see if the relay is clicking # 41 under hood relay box.

NO. NO.

Hmmm ok we are a bit of a loss then. We saw a few people say to change the crankshaft position sensor to help fix the issue so I was curious if that would work or not. Any other suggestions than what was given with your link? Hmmm ok we are a bit of a loss then. We saw a few people say to change the crankshaft position sensor to help fix the issue so I was curious if that would work or not. Any other suggestions than what was given with your link?

Any chance it could be the Oil Pressure Safety Switch? Any chance it could be the Oil Pressure Safety Switch?

did you reset the code did you reset the code

Yes we reset the code several times and each time we try to start the car, the code comes back up. Yes we reset the code several times and each time we try to start the car, the code comes back up.