My 1988 oldsmobile cutlass calais 3.0 V6 has a code 13. How do you test for an open circuit in the oxygen circuit?
Thursday, August 25th, 2011 AT 12:48 AM
It's not necessarily an open circuit. It's just reading below 500mv for too long. That could also mean a severe lean mixture. You will have to use a DVOM to measure voltage right at the sensor but it would make more sense to just replace the sensor and clear to code to see if you still have a problem.