What would cause code P1603 to occur on 2005 Jeep Rubicon

Marvin

• 85242 Answers
• Posted on Sep 17, 2008

SOURCE: jeep engine swap

Yes it will fit, make sure the engine swap is approved by the BAR.

SOURCE: What is a P 431

p431 = Warm up Catalyst effiiciency below threshold on Bank 2. Most likely you have an O2 sensor that has a defective heating circuit.
p513 = The engine controller has received an invalid key from the Smart Key Immobilizer Module. Unless you had or have the wrong ignition key, this one can be solved on this chat.

SOURCE: 2005 jeep wrangler unlimited rubicon

Do not drive it 'till you have the problem solved or if you already haven't lost the cylinder head gasket, you will!!
First thing to check is that the fan (s) works. If mechanical and electric fans are good, check the thermostat. In fact, just replace it as it is inexpensive and once overheated they become unreliable.
Make sure the cooling system is full when cold, both in the recovery bottle and in the radiator If it's not full, check for leaks hot and cold..
If you have any unexplained coolant loss and see white smoke from the exhaust, the head gasket has failed. If you have a 4.0 engine, also be aware that they develop micro-cracks in the cylinder head (problem began in about 2000 but there are still a few showing up) All heads from 2000 and up should be magnafluxed to prevent re-use and immediate failure after a head gasket has been replaced.
Your radiator needs to be flow tested as well but at 5yrs old, unless there is a huge amount of minerals in the water in your location, likely it's good.
Work from the easy items up to the more difficult, unless you see something that definitely has a problem. If you have a question about what you find, just ask. If you have no experience it is a good idea to buy a chilton or haynes manual before beginning. That will save you lots of time and aggravation!