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P0135 Diagnostic Trouble Code Discussion for November 2017

Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Performance

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Trouble Ticket Help Requests for DTC P0135
Help Request Posted
1997 Mazda B2300 2.3L Poor Idle Quality VIN: 4F4CR12A5V
P0135: Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Malfunction. This truck for as long as I have known since it has been coming into my shop has always had a knarly idle. Not really uncomfortable,very drivable, never stalls but with just a hint of misfire even though it does not show up on Mode 6 diagnostics. Fuel trim...
November 30, 2017