Chevy HHR P0139: O2 Sensor Slow Response (Bank 1 -Sensor 2)
P0139 is a common OBDII code that occurs in many vehicles, including the Chevy HHR. The code is triggered when there is an issue with the response time from the oxygen (O2) sensor when switching voltage levels. The Oxygen sensors are responsible for helping the ECM meter oxygen levels in the exhaust, and helping to … Read more