At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
My 2000 Lexus RX300 shows both P0171 bank 1 lean , and P1150 bank 2 sensor 1 mal. . According to the freeze frame data bank 2 sensor 1 is lean shows +19 and +52 and bank 1 is rich -ve .
Bank 1 sensor 1 shows -0.5 and -10.5.
It confuses me. Whether I need to change the bank 2 sensor 1, or there may be other problem?
Thanks.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
change fuel filter first, if it has not been done recently
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
O2 SENSOR
O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
O2 SENSOR HEATER OPERATION
TPS VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE CLOSED
TP SENSOR SWEEP
MAP SENSOR OPERATION
ECT SENSOR OPERATION
ENGINE MECHANICAL PROBLEM
FUEL FILTER/PRESSURE REGULATOR (HIGH)
PCM
Check the attached links,
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
P0171 Fuel trim bank one condition Lean (If bank one and two codes set together suspect fuel pressure or MAF sensor. Or O2 sensor defective
P0174Fuel trim bank two condition Lean (same as above or Failed H02S21 Heated O2 sensor Bank 2 sensor 1)
It could be caused by many things, but generally it means that your engine is running too lean - usually indicating a vacuum leak. It could also be that the O2 sensor is bad and giving a false reading.
Hi there: P0171 - System Too Lean (Bank 1) P0174 - System Too Lean (Bank 2) Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
A code P0171 or P0174 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor.
Possible solutions include: In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect all vacuum and PCV hoses, replace if necessary Check for a dirty fuel filter and proper fuel pressure
P0171 indicates system lean (bank 1). P0134 indicates no activity from sensor 1 on bank 1. You could have a bad O2 sensor or an actual lean condition. Possible causes of a lean condition include a restricted fuel filter on a vacuum leak.
P0171 is saying that bank# 1 sensor one is in a lean condition thats an oxygen sensor This is an incorrect reading because the 02 sensor is malfunctioning for some reason or your haveing some kind of fuel delivery issue its more likely that it is the sensor it would be the closest to the front end of the vehicle and would be located in the Y pipe comeing off the cylinder head exhust ports but # 1 is the closest to the front
what are the new codes clearing / resetting doesnt fix the problem the p0171 code has about ten different causes just changing or cleaning the sensor may not have been your problem P0171 System Too Lean Bank 1 rescan and get all codes then look up each one most sites have causes and solutions for obd ll trouble codes
×