Hey could someone please help me with figuring out the following error codes after installing catless downpipes and renntech stage 2 tune I’ve tried clearing the codes….but cel comes on right away. Any help would be greatly appreciated.

P262900 , P141100 , P143700 , P13C700

 

*****If your car came with the AMG performance exhaust option I would check and make sure the exhaust flap valve connectors were hooked back up and are receiving a signal if they are indeed hooked up. - there are three of them, one at the mid pipe area, and one on each bank by each muffler at the back of the car. Also verify that the flaps are opening and closing by cycling them with the dashboard switch.

Also check the connections at the downpipe oxygen sensors to make sure they were re-installed, and are getting a signal. Clearing a CEL on an circuit that is either damaged or not returning a proper feedback signal for some reason will still produce a code - that's why there are feedback loops that provide a scan tool and the computer with the data.

The good news is all of those codes are fixable once the circuit and feedback loop data is back within specs. It is not uncommon to get CEL's from downpipe installs for a variety of reasons, especially ones without CAT's. There are ways of re-establishing the normal signal pattern and threads exist on this site regarding products designed to mimic the now missing CAT's to fool the ECM in to thinking the CAT's are still there, assuming the tune was purchased with the tuners knowledge that it was going on a car with the modifications you have listed. When in doubt, ask the tuner if what is written above seems like gibberish or you don't feel comfortable or know how to check and fix what is listed above as possible issues. Or, take it to a competent tuner/mechanic who will figure it all out for you, perhaps for a six pack of decent beer, or an apple strudel pie, a crisp $20 bill, a sincere thank you for their time and efforts, etc..

If it can be broke, it can be fixed I always say! (I say other **** too, and it has incalculable value to some, and is worthless to others, or pretty much everyone else..)

 

Good morning I have the same problem, how did you resolve this please?