S10/T10 P/U 2WD V6-4.3L VIN W (1997)
Oxygen Sensor: Service and Repair
Engine Rough, Miss, and Oxygen Sensor DTC's
****TSB Update 77-65-12, April 1997****
Subject:
Engine Rough, Miss, and Oxygen Sensor DTCs (Replace Oxygen Sensor Jumper Harness).
Condition
Some owners may comment about an engine miss and/or roughness and a SES light.
Cause
Some oxygen sensors on the passenger side of the vehicle have been found to be damaged due to water intrusion. Approximately 20% of the oxygen
sensors returned for analysis on these models have exhibited this condition. If any oxygen sensor related DTC is stored, moisture may have entered the
jumper harness that connects the three passenger side oxygen sensors to the main engine harness and damage the sensor and the harness. Oxygen sensors
that have been damaged by water will have corrosion on one or more of the sensors (4) terminals. The jumper harness connector at the same location
should show similar corrosion. If there is undetected moisture in the jumper harness, a replacement oxygen sensor can be damaged resulting in a repeat
failure. In addition, a replacement oxygen sensor may be misdiagnosed as faulty when the actual fault is undetected moisture in the jumper harness.
