Is my O2 Sensor Bad?

andrewtrxnn

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Everything seems normal to me except signal skimming. I have Megan Racing Catless Downpipes with an 02 Extender on the downpipes. An CTS Intake and a JB4 Tune. I occasionally run E30, please let me know what might be going on. Will it cause my car to run any differently?

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black_sedan

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I was also getting some random codes with my catted DP prior to doing a tune. jb4 does not turn off the o2 codes, so you would need to do an ECU tune and have those codes tuned out.
 

Silverbmpra

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Did you ever figure this out? I just got the same codes...I've gotten many different o2 codes with ets dp, but the heater one is consistent...the skimm one I read it means you were running too much e and your dme thinks you're always running lean...I am testing that theory now...my car is running really rich according to jb4
 

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If you change your dp then expect the o2 sensors to trip
 

Silverbmpra

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I understand that, many people are running aftermarket dps with no cel...I am also on a e30 blend and always pay attention to cel in case it's something important...I was just wondering if anyone was able to fix this issue. I changed the o2 sensor and cel just came back after 2 weeks...wasn't sure if I am doing something wrong
 

Mason

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I understand that, many people are running aftermarket dps with no cel...I am also on a e30 blend and always pay attention to cel in case it's something important...I was just wondering if anyone was able to fix this issue. I changed the o2 sensor and cel just came back after 2 weeks...wasn't sure if I am doing something wrong
Which dp you have?
 

Mason

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Ets catted dp with 4in connection...
Sometimes those throw CEL. Nothing really you can do.

Well.. besides getting a different dp. If you’re that worried about the light
 

Silverbmpra

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I am not...but I just read the cel should be a cat efficiency one not a lambda probe heating after cat malfunction with internal resistance too high...
 

Silverbmpra

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So does that mean I have a bad o2 sensor? Or is that cel also possible with aftermarket dp?
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