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Re: O2 Sensor Heater Problem
The black wire is the ground for the heater in the sensor. You found it has an open circuit, that's what is causing the P0135. You can either trace it back until you find the break in the wire*, or you can solder on a new piece of wire and attach it to a good, clean, chassis ground. Problem solved! Good job!
* The original ground for the heater is to a bolt in the rear of the driver side cylinder head.
Clearing the DTC's will remove all DTC's from memory. Performing the drive cycle "forces" the ECM to run and complete the monitors. If all of the monitors run and complete their tests, and they all pass, the SES light will remain off.
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You have to know how it works,
to figure out why it doesn't.
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