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CEL Codes: P0031, 37, 51 & 57

Cydog
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Cydog Member

Cydog

Posted
Posted

2009 C4S Cabriolet with Sharkwerks/EVOMS ECU flash and Fabspeed headers/cats has a persistent CEL with codes P0031, 37 51 & 57:

 

H02S Heater Control Circuit

Low Bank 1 Sensor 1 (P0031)

Low Bank 2 Sensor 2 (P0037)

Low Bank 2 Sensor 1 (P0051)'

Low Bank 2 Sensor 2 (P0057)

 

Both pairs of upstream and downstream 02 sensors have been replaced and the CEL codes erased, but the same CEL codes pop up at the next startup.  Any ideas on the source of the errors and the fix!? 

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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

Welcome to RennTech :welcomeani:

Couple of possibles: (1) A wiring issue causing the heaters to malfunction. (2) The reflash itself.

 

A lot of people have experienced all sorts of weird DME issues after getting aftermarket reflashes done as these systems are quite often set up to try to eek out small power gains by trying to trick the basic DME engine control functions, everything from strange codes to blocking connection to the OBD II port.  Returning the vehicle to the factory DME flash put an end to the problems. 

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Cydog Member

Cydog

Posted
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Posted
1 hour ago, JFP in PA said:

(1) A wiring issue causing the heaters to malfunction

 

Thank you for the welcome!  Is there a possibility of a fuse that's blown?

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