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      01-27-2018, 03:36 AM   #1
lrz
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Z4M error codes, help needed

HI guys,
What is the problem according to this ecu errors?
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      01-27-2018, 08:10 PM   #2
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Can't be certain, but my guess would be that "sensor stuck rich" code is the more causal one. If the computer is trying to trim out a nonexistent rich condition caused by a bad sensor, the (still good) post-cat sensors screaming about an actual lean condition make sense.

Both post-cat sensors reading a lean condition is bad, regardless. Don't drive the car like this.
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      01-28-2018, 07:00 AM   #3
lrz
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Quote:
Originally Posted by mattfwalters View Post
Can't be certain, but my guess would be that "sensor stuck rich" code is the more causal one. If the computer is trying to trim out a nonexistent rich condition caused by a bad sensor, the (still good) post-cat sensors screaming about an actual lean condition make sense.

Both post-cat sensors reading a lean condition is bad, regardless. Don't drive the car like this.
I have no mufflers so I guess the post errors are not relevant or harming the engine.
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      01-28-2018, 01:28 PM   #4
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I got 2 of your 3 codes after I put on my section 1 pipes. Since they are post I wasn’t to concerned. I did eventually replace the post o2 sensor and reset the codes, they haven’t returned.
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      01-28-2018, 08:36 PM   #5
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Quote:
Originally Posted by lrz View Post
I have no mufflers so I guess the post errors are not relevant or harming the engine.
That's quite an assumption. Feel free to make it, of course, but if the ECU is actually trimming fuel based on the "stuck rich" input due to a bad sensor, your car might actually be running lean on that bank.
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      01-30-2018, 07:08 AM   #6
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I have SS stepped headers, I read here in the forum that this is the cause for the problem.
How can I fix it? Which sensors do I need to relocate and where?
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      02-01-2018, 05:56 PM   #7
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Quote:
Originally Posted by lrz View Post
I have SS stepped headers, I read here in the forum that this is the cause for the problem.
How can I fix it? Which sensors do I need to relocate and where?
After I installed SS stepped headers I did not get these codes.

Do you have a tuner in your area? If it were me, I would have it diagnosed. Maybe a custom tune will rid you of the problem.
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