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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > SES Light



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      11-10-2011, 07:26 PM   #1
charles.soori
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SES Light

About a week ago my ses light came on checked it with my BT tool and i got this, i did clear it once but after parking the car and starting in the morning it came back so i know it needs to be changed but my question is which side driver or passenger?

2CA7:
2CA7 Lambda probe heating in front of catalytic converter 2, function
Error will cause a warning light
Error is currently present
Test conditions have been completed
Short circuit or signal interruption

Freeze Frame Information
Event 1Odometer 54680kms 33976miles
symptom Lambda probe heating in front of catalytic converter bank 2 1.00 0-n
Battery Voltage 14.85 V
Lambda probe heating in front of catalytic converter bank 2 63.67 %
ceramic temperature Lambda probe in front of catalytic converter bank 2 0.00 C

Event 2Odometer 54704kms 33991miles
symptom Lambda probe heating in front of catalytic converter bank 2 1.00 0-n
Battery Voltage 12.80 V
Lambda probe heating in front of catalytic converter bank 2 97.27 %
ceramic temperature Lambda probe in front of catalytic converter bank 2 0.00 C

Event 3Odometer 54768kms 34031miles
symptom Lambda probe heating in front of catalytic converter bank 2 1.00 0-n
Battery Voltage 14.34 V
Lambda probe heating in front of catalytic converter bank 2 80.08 %
ceramic temperature Lambda probe in front of catalytic converter bank 2 0.00 C



2C3E:
2C3E Lambda probe in front of catalytic converter 2, Leitungsfailure Kabelcable oder Ubertragungsfehler transmission?
Error will cause a warning light
Error is not currently present
Test conditions have been completed
Short circuit or signal interruption

Freeze Frame Information
Event 1Odometer 54680kms 33976miles
Lambda-nominal value group 2 0.99 -
voltage offset signal path CJ120 2 0.00 V
voltage Lambda probe in front of catalytic converter bank 2 0.20 V
ceramic temperature Lambda probe in front of catalytic converter bank 2 0.00 C

Event 2Odometer 54688kms 33981miles
Lambda-nominal value group 2 0.99 -
voltage offset signal path CJ120 2 0.00 V
voltage Lambda probe in front of catalytic converter bank 2 0.00 V
ceramic temperature Lambda probe in front of catalytic converter bank 2 0.00 C
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      11-11-2011, 06:15 AM   #2
ENINTY
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Okay, so you know the car has an in-line six cylinder engine, right? There is no "passenger side" vs. driver's side" location of the O2 sensors (they are all on the passenger side). The trouble codes you are getting mean the O2 preheat function is not working and the sensor needs replacement. The car has four (4) O2 sensors, one each in front and one behind each of the two catalytic converters in the exhaust system. The exhaust system is broken down into two "Banks" of three cylinders each. Bank 1 is cylinders 1,2, and 3 (the first three cylinders in the engine from front to back). Bank 2 is the second set of three cylinders 4, 5, and 6 (the rear most three). The O2 sensor that is bad is Sensor 1, which is the O2 sensor in front of the Bank 2 catalytic converter. You can see it from the top of the engine if you look at the exhaust manifold for the rear most cylinders (it's right near the right-side shock tower).

There is a DIY in the DIY section to replace this O2 sensor. BMW has jacked the price way up on the O2 sensors ($215 USD from Tischer). I'd try to find the Bosch (Bosch is the OEM supplier to BMW) equivelent aftermarket sensor.
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      11-13-2011, 10:19 PM   #3
charles.soori
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Thanks for your help.
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