[Sticky] P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

Description

Indicates increasing time for front oxygen sensor (Bank 1, Sensor 1: input of catalytic converter) to get operating condition/temperature after the cold start. Usually means brakes or shortcuts in- or out- sensor wiring.

Symptoms

• Check Engine dashboard light is ON
• Possible increased fuel consumption

Causes

• O2 sensor heater wiring or connectors issues
• Faulty O2 sensor heater element

Severity - low

Does not require immediate replacement, but in a log time perspective could lead to spark plugs foul-out. Increasing fuel consumption and pollution.

Troubleshooting

• Check and replace, if required, front oxygen sensor
• Check and replace, if required, wiring of front oxygen sensor