Mechanics

I WAS GETTING THE FOLLOWING CODES ON THE CAR PLEASE HELP

2001 Chevrolet Impala • 93,303 miles

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?
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Dcast352
December 27, 2011.




The P0420 is usually a cat the P0128 is usually a thermostat. What size engine do you have?


Saturntech9
Dec 27, 2011.
The car looks like this.


Tiny
Dcast352
Dec 27, 2011.
Its a 6 cylinder, 3.4 liter I think but idrk how to tell


Tiny
Dcast352
Dec 27, 2011.
Yes, it is a 3.4L


Tiny
Dcast352
Dec 27, 2011.
Look thru the drivers side bottom of the wind shield you find the vin plate what is the 8th digit of the vin?That will tell me which engine you have.


Saturntech9
Dec 27, 2011.
It's not the original engine. I can tell you its a 3400 sfi, I can still give you the VIN if it will help but it isn't the original engine.


Tiny
Dcast352
Dec 27, 2011.
Yeah give me the vin that way I can tell if it came with a 3.4L


Saturntech9
Dec 27, 2011.
2g1wf52e019275561


Tiny
Dcast352
Dec 27, 2011.
Well idt its going through the 8th character in the vin is an E
AD


Tiny
Dcast352
Dec 27, 2011.
2g1wf52e019######


Tiny
Dcast352
Dec 27, 2011.

AD