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-   -   O2 sensor Location... (http://www.peachparts.com/shopforum/tech-help/128984-o2-sensor-location.html)

CMYBENZ 07-19-2005 03:27 PM

O2 sensor Location...
 
Hello all...

Just returned from a MB dealer diagnostic with the following error results:

1. Hi voltage for rear O2 sensor

Code PO138- Circuit High Voltage and Switchover valve controls
Recieved "Mixture too rich" fault.

2. Upshift delay- My car shifts aggressively in 1st and 2nd gear, moreso
when cold. Dealer indicated that is may be Throttle actuator, whatever the hell that is....

I was informed that the O2 sensor needs replacing...Please educate me on where the O2 sensor is on a 1994 C220 and if this is a difficult process to replace. Thanks in advance.

Ali Al-Chalabi 07-19-2005 03:52 PM

On the exhaust. The rear O2 sensor is the one downstream of the cat.


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