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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > 2CA9 Lambda probe heating behind catalytic converter 2, function



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      11-28-2012, 06:02 PM   #1
michaelalex17
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2CA9 Lambda probe heating behind catalytic converter 2, function

hello, i put this thread in another section but got new responses and i dont want to drive the car if it will damage it so i want a fast answer to the question. i started my car the other day and got a service engine soon light. i restarted the car and the warning went away. i scanned the car with the BT scan tool and got this code. i researched it and it seems to be people who change there dp's mess up on the install and get this code. i havent touched the dp's or done anything to the car so does anyone know whats causing this? thanks


2CA9:
2CA9 Lambda probe heating behind catalytic converter 2, function
Error will cause a warning light
Error is not currently present
Test conditions have been completed
Short circuit or signal interruption

Freeze Frame Information
Odometer 74296kms 46165miles
exhaust fume temperature behind catalytic converter bank 2 368.00 C
resistor Lambda probe behind catalytic converter bank 2 5,632.00 ohm
Lambda probe heating behind catalytic converter bank 2 53.13 %
voltage Lambda probe behind catalytic converter bank 2 0.63 V
Event 2
Odometer 74296kms 46165miles
exhaust fume temperature behind catalytic converter bank 2 320.00 C
resistor Lambda probe behind catalytic converter bank 2 5,376.00 ohm
Lambda probe heating behind catalytic converter bank 2 53.91 %
voltage Lambda probe behind catalytic converter bank 2 0.61 V
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      11-29-2012, 08:06 AM   #2
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Im not an expert, but maybe the oxygen sensors post-cat are going? Since you have almost 50k mi thats not unreasonable. If so this will not hurt your car. Secondary o2 sensors only read catalytic efficiency and are not involved in adjusting AFRs like the primary ones are. If you're not getting any fuel mixture codes then you're okay.

Do you have stock downpipes? Are you running a tune? If you're tuned I would definitely data log and make sure alls well.
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      11-29-2012, 03:37 PM   #3
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Quote:
Originally Posted by sickem View Post
Im not an expert, but maybe the oxygen sensors post-cat are going? Since you have almost 50k mi thats not unreasonable. If so this will not hurt your car. Secondary o2 sensors only read catalytic efficiency and are not involved in adjusting AFRs like the primary ones are. If you're not getting any fuel mixture codes then you're okay.

Do you have stock downpipes? Are you running a tune? If you're tuned I would definitely data log and make sure alls well.
i have stock downpipes. i think your right it might be the 02 sensor
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      11-29-2012, 08:21 PM   #4
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O2 sensor, bank 2, the one behind the catalytic converter, just as your BT tool said.

Got mine swapped out 2 yrs ago. Love the BT tool

There are 4 O2 sensors total (2 pre, 2 post catalytic converter). My mechanic didn't know which one was bank 1 or 2, so I had both swapped out, which fixed the problem. Labor's expensive in NorCal, and I didn't have time to consult my Bentley manual (since this was my only car at the time).
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      11-30-2012, 10:33 AM   #5
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Originally Posted by orionredwing View Post
O2 sensor, bank 2, the one behind the catalytic converter, just as your BT tool said.

Got mine swapped out 2 yrs ago. Love the BT tool

There are 4 O2 sensors total (2 pre, 2 post catalytic converter). My mechanic didn't know which one was bank 1 or 2, so I had both swapped out, which fixed the problem. Labor's expensive in NorCal, and I didn't have time to consult my Bentley manual (since this was my only car at the time).
thank you very much
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