New O2 Sensor -- Code 12 on DM -- Defective?

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New O2 Sensor -- Code 12 on DM -- Defective?

08-11-2011, 07:18 PM

EricSilver EricSilver is offline

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Join Date: Mar 2000

Location: Fairfax, VA

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New O2 Sensor -- Code 12 on DM -- Defective?

Car: 1995 E320 / M104.992

Had an O2 sensor installed a few weeks ago. Was an aftermarket,no specific brand purchased on eBay. Got a CEL today with a code 12 on the DM:

12 Heated oxygen sensor heater circuit open or circuit short

Is it a faulty sensor or something else?

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