P0155 means o2 sensor heater circuit malfunction (bank 2, sensor 1). The heater in the bank 2 upstream O2 sensor has failed. Identical issue to P0135, on the other bank of a V6/V8.
Drive gently and get it diagnosed within days.
The heater in the bank 2 upstream O2 sensor has failed. Identical issue to P0135, on the other bank of a V6/V8.
Most common.
Cheapest check.
Harness damage.
Replace.
Typically $150–$400
O2 sensor replacement typically $150–$400. Estimates vary by vehicle. Costs are estimates and vary by vehicle, location, and shop.
Safe to drive; fix before emissions testing.
Typically $150–$400. O2 sensor replacement typically $150–$400. Estimates vary by vehicle.
Drive gently and get it diagnosed within days.
The most common cause is failed heater element. Most common.