I WAS GETTING THE FOLLOWING CODES ON THE CAR PLEASE HELP
2001 Chevrolet Impala
December, 27, 2011 AT 4:49 AM
I ran diagnostics on the car and got these codes
PO420- Catalyst System Efficiency below threshold (bank1)
PO341- Camshaft position sensor circuit range/performance
PO128- coolant thermostat
PO440- Evaporative emission control system malfunction
What would cause these and how do I fix it?
I deleted all the codes and the check engine light went off and hasn't come back on but havent drove it much, also getting smoke out of the exhaust. Wasn't doing it when I bought the car. Don't really know much about the car. Just changed the oil today and that seemed to help the smoke a little?