Hello,

I am hoping someone out there can help me with my situation, My check engine light came on and when i go to check the codes the following codes appear.

P2251
P0134
P1055
P2631

I understand most of those codes refer to the O2 sensors so i replaced all 3 of them in the car as well as new spark plugs from the factory and the codes still will not clear.

I am not sure if the combination of codes lead to a specific issue so any help would be greatly appreciated.

Thanks in advance

 

Codes and fact that O2 sensor replacements did not help suggest damage to wiring, connectors, or PCM. Any accidents or work done under dash? Any history of water inside car due to snow, ice? PCM is located on center hump under dash.

You will need a shop manual, Volt-Ohm Meter, some electrical experience, and lots of patience to run this problem to ground on DIY basis. It is unlikely a simple faulty component.

To summarize, you will need to use the shop manual wiring diagram to locate correct wires at PCM, disconnect from PCM, and test each wire from PCM to O2 sensor connector for open or shorts, and repair as indicated.

It could be a damaged PCM also. This would be concluded if wiring/connectors check as good.

A shop manual can be downloaded for $22 from automanualsource.com.

Some have managed to find free download manuals. Check DIY forum, and Online Manuals thread for possibilities. I think most links are for manuals too old to help you.

good luck