BMW Cars 1999-06

2.5L L6 - Std 6

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Trouble Code: P3023



O2S Sensor Disturbed SPI Communication to WRAF-IC (Bank 2 Sensor 1)

Possible Causes:



Internal HW fault in control module
 
Replace control module
 

Trouble Code: P3024



O2S Sensor Initialization Error WRAF-IC (Bank 1 Sensor 1)

Possible Causes:



Internal HW fault in control module
 
Replace control module
 

Trouble Code: P3025



O2S Sensor Initialization Error WRAF-IC (Bank 2 Sensor 1)

Possible Causes:



Internal HW fault in control module
 
Replace control module
 

Trouble Code: P3026



O2 Sensor Operating Temperature Not Reached Bank 1 Sensor 1

Possible Causes:



Oxygen sensor heater for oxygen sensor (HO2S) before catalytic converter is faulty
 
O2S is contaminated (due to presence of silicone in fuel)
 
O2S signal and ground circuit wires crossed in wiring harness
 
O2S signal circuit is shorted to sensor or chassis ground
 
O2S element before the catalytic converter has failed (internal short condition)
 
Leaks present in the exhaust manifold or exhaust pipes
 

Trouble Code: P3027



O2 Sensor Operating Temperature Not Reached Bank 2 Sensor 1

Possible Causes:



Oxygen sensor heater for oxygen sensor (HO2S) before catalytic converter is faulty
 
O2S is contaminated (due to presence of silicone in fuel)
 
O2S signal and ground circuit wires crossed in wiring harness
 
O2S signal circuit is shorted to sensor or chassis ground
 
O2S element before the catalytic converter has failed (internal short condition)
 
Leaks present in the exhaust manifold or exhaust pipes
 

 
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