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      04-10-2015, 08:29 PM   #1
lazyninja87
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P122C and P124D trouble codes ??

Got the service engine light earlier today and my code reader reads these two codes P122C and P124D. I've been trying to research them but have been unsuccessful. Does anyone know what they mean?

2010 335d
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      04-10-2015, 09:19 PM   #2
Yozh
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Really dislike those generic codes as there is barely any interpretation of them.
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      04-10-2015, 10:56 PM   #3
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Quote:
Originally Posted by lazyninja87 View Post
Got the service engine light earlier today and my code reader reads these two codes P122C and P124D. I've been trying to research them but have been unsuccessful. Does anyone know what they mean?

2010 335d
You've got a problem with one or both NOx sensors; one of the codes indicates a short or something.

http://autodiagcart.com/wrd/wp-conte...-2009-2010.pdf
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      04-11-2015, 07:46 AM   #4
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Quote:
Originally Posted by floydarogers View Post
You've got a problem with one or both NOx sensors; one of the codes indicates a short or something.

http://autodiagcart.com/wrd/wp-conte...-2009-2010.pdf
I agree - check the connector on the upstream NOx sensor

P124d = 4BF5 NOx sensor before DeNOx catalytic converter, signal NOx

P122c = front NOx sensor heater circuit monitoring fault as I recall.
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      04-11-2015, 11:03 AM   #5
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Quote:
Originally Posted by ingenieur View Post
I agree - check the connector on the upstream NOx sensor

P124d = 4BF5 NOx sensor before DeNOx catalytic converter, signal NOx

P122c = front NOx sensor heater circuit monitoring fault as I recall.
It's bad ? that you have that knowledge stuffed away in your memory.
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      04-11-2015, 10:57 PM   #6
lazyninja87
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Thanks all... I'll be looking into replacing the NOx sensor

Quote:
Originally Posted by ingenieur View Post
I agree - check the connector on the upstream NOx sensor

P124d = 4BF5 NOx sensor before DeNOx catalytic converter, signal NOx

P122c = front NOx sensor heater circuit monitoring fault as I recall.
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