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Old 07-19-2005, 03:27 PM
Posts: n/a
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.

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Old 07-19-2005, 03:52 PM
Ali Al-Chalabi's Avatar
Senior Member
Join Date: Nov 2000
Location: Knoxville, TN
Posts: 1,837
On the exhaust. The rear O2 sensor is the one downstream of the cat.

Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
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