P0155 O2 Sensor Heater Circuit Malfunction (B2S1)

Description and meaning of DTC p0155

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. This code refers to the front oxygen sensor on Bank2. The heated circuit in the oxygen sensor decreases time needed to enterclosed loop. As the O2 heater reaches operating temperature, the oxygen sensorresponds by switching according to oxygen content of the exhaust surroundingit. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed beforethe oxygen sensor began operating properly, it will set P0155. See also: P0135(Bank 1).

p0155 diagnostic trouble code symptoms

You will likely notice poor fuel economy the illumination of the MIL.

DTC p0155 - possible causes

A code P0155 may mean that one or more of the following has happened:O2 Heater element resistance is highInternal short or open in the heater elementO2 heater circuit wiring high resistanceopen or short to ground in the wiring harness

How to fix OBD-II diagnostic trouble code p0155

Repair short or open or high resistance in wiring harness or harness connectorsReplace oxygen sensor (cannot repair open or short that occurs internallyto sensor)

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