[lazyninja87]

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

[Yozh]

Really dislike those generic codes as there is barely any interpretation of them.

[floydarogers]

Originally Posted by lazyninja87

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

[ingenieur]

Originally Posted by floydarogers

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.

[floydarogers]

Originally Posted by ingenieur

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.

[lazyninja87]

Thanks all... I'll be looking into replacing the NOx sensor

Originally Posted by ingenieur

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.

[mefferso]

Originally Posted by lazyninja87

Thanks all... I'll be looking into replacing the NOx sensor

Any resolution? I just got the 4bf5 code last week.