Posts Tagged: P0031

P0031 Code Explained: Causes, Symptoms, and Fixes

How to Diagnose a P0031 Code With a Step by Step Procedure Quick Summary A P0031 trouble code indicates the engine computer has detected a problem in the heater control circuit for the upstream oxygen sensor on Bank 1, Sensor 1. In plain English, the sensor’s built-in heater isn’t drawing the current the ECM expects, so the sensor may warm up too slowly, delaying fuel-control corrections. The most common causes are: • A failed oxygen sensor heater • Blown fuse for the oxygen sensor heater • Damaged wiring to the … Read More