Hi guys,

I'm new to the forums but haven't had a real need to post anything until now. I'll give you a quick summary of my issue; my 2010 Outlander had a cracked engine block so a new engine was installed. I've had the replacement engine for a few months but I've had a few issues ever since.

I have the "Torque" app on my Android phone which allowed me to read these CEL codes: P0171 and P2195. The P2195 comes and goes every few hundred KMs although I think P0171 is a pending code that never turns on the actual CEL.

Here are some other symptoms to add detail to the issue: within a few minutes of driving, when sitting idle, the RPM needle will bounce. Sometimes it's a very minor bounce but occasionally it's pretty rough.

Noise wise, the engine sounds OK. I don't notice any air leak related noise but I suppose that could be the problem.

I've taken it back to the mechanic who installed the engine and he's insisted that their connections are all tight and that it's probably a bad O2 sensor. I doubt that since the O2 sensor was working properly before the new engine. Perhaps the MAF is dirty or a leak is occurring somewhere? Not sure what to do, I want to go back to the mechanic but not sure what to tell him!

Any help will be greatly appreciated!

Thanks,

Chris

 

https://mitsubishiforum.com/forum/mi...1-p0174-41710/

Obd2 Code P 2195 Ceck Engine Lite Is on . What Does the Code Mean

sounds like a bad O2 sensor.

 

Is it possible for an O2 sensor to just become bad after a new engine was installed? Or is this merely coincidence?

I should mention that I've noticed no change in fuel economy at all... Is poor fuel economy usually an indicator of a bad O2 sensor?