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Hi, I originally posted this mistakenly in the performance thread. I am new to the lexus family. I am trying to get information regarding oxygen sensor problems with aftermarket midpipes. Problem started with CEL codes that came up on 05/25/2019. About 5 weeks prior to the CELs, I had a shop installed a brand new aftermarket exhaust (ARK GRIP catback exhaust) for my 2014 lexus IS350 RWD. The codes shown in my obd scanner had to do with problems on the maf sensors, coil ignitions, spark plugs, fuel injector, intake manifold leak, and possibly oxygen sensors. I checked the necessary. Spark plugs were fine, no air leak, so what was left was fuel injectors/oxygen sensors. So i had to take it to the dealer on 05/29/19 because my engine was idling very rough to the point which I Dealer called me today 06/05/19 saying sensors may be the cause of all CEL codes. The sent me pictures of the current state of the oxygen sensors. According to the certified tech who is dealing with my vehicle, the shop who installed the exhaust torched the heat shield/housing of the oxygen sensor in order to get access which may be the problem why the sensors are not reading what they are supposed to. My question to you guys is if anyone has experienced oxygen sensor related where an aftermarket midpipe may be the problem? I have uploaded the CEL codes as well the oxygen sensors photos provided by the dealer. Thanks!
The gasflow might be too high with the new mid pipe. Try putting an adaptor between the O2 sensor and the mid pipe, moving the sensor out a bit. This helped on the Audi A4 I had.
06-07-19, 11:30 AM
Oxygen sensor Problem on aftermarket midpipe
