Code P0145 on a 2003 GMC Envoy indicates a problem with the oxygen sensor circuit, specifically for the bank 1 sensor 3. This may suggest that the sensor is reading incorrectly, there is a wiring issue, or a problem with the exhaust system. It's important to diagnose the issue further to determine whether the sensor needs replacement or if there are other underlying problems in the circuit.
Trouble code P0145 means: O2 Circuit Slow Response (Bank 1, Sensor 3) Replace O2 sensor
You must get the code read from the OBDII port using a code reader or scan tool device. The code will define your problem as reported by the on board computer (PCM) and will almost always give you a solution for the fix immediately. www.trailvoy.com All the answers for you Envoy or Trailblazer (GMT360 platform)
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