92 Olds ECM Code 13

On this page we will illustrate how to diagnose and repair a problem related to Engine Trouble Code 13.  Take note that the problem we encounter in this vehicle will not cover all issues related with a Code 13.  The vehicle we are working on is a 1992 Oldsmobile equipped with a 6-cylinder engine.

As you can see in the image, there is a Trouble Code 13 displayed on the hand-held scanner.

After reading the data from all the sensors, we discovered that the oxygen sensor data wasn't changing.  It was stuck on .444mv.  Based on this information, we determined that the problem was related to the oxygen sensor circuit.













As we were ready to test the oxygen sensor, we discovered a broken ECM Ground Wire.


















We used a jumper cable to connect the ground wire to do a preliminary test.  We started the engine, connected the hand-held scanner to the OBD1 Port, and proceeded to read the oxygen sensor data.  The oxygen sensor began to work normally.














Next, we removed the broken wire from the cylinder head.


















The remaining ground wire was long enough for us to attach a new terminal.  It would still reach its original location.



















As shown in this image, we attached the repaired ground wire back on the cylinder head.  We started the engine, and it ran fine.  The check engine light didn't turn on anymore.