Writing about our 2002 Chevy Cavalier that has NOT been hassle-free. The latest is a Check-Engine
light on. AutoZone use their troubleshooting meter and it produced the following info:
Definition: Catalyst Efficiency low-bank 1
Explaination: The oxygen sensors monitor the Catalystic Converters abilty to store oxygen
Probable Cause: Catalytic converter
defective (failure possibly due to #2, 3, or 4), Engine misfire or running condition, large vacuum leak, Engine oil leakage into Exhaust
-valve guide seals, piston rings.
Most recent repair on this car was early March. Included remove/replace A/C pressure sensor & harness and an oil change (nearly $500!). No idea if there is any connection to this, but thought I'd mention. We also had a tune-up done in NOvember 2010.
Cooincidentally, just today, I had the Oxygen Sensor changed on our 2001 Subaru Forester. We never get a break with these 2 cars lately!
Could you please point me in the right direction?