I WAS GETTING THE FOLLOWING CODES ON THE CAR PLEASE HELP

  • Tiny
  • dcast352
  • 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?

Tuesday, December 27th, 2011 AT 4:49 AM

19 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

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

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Tuesday, December 27th, 2011 AT 4:55 AM
  • Tiny
  • dcast352
  • Member

The car looks like this.

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Tuesday, December 27th, 2011 AT 4:56 AM
  • Tiny
  • dcast352
  • Member

Its a 6 cylinder, 3.4 liter I think but idrk how to tell

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Tuesday, December 27th, 2011 AT 4:58 AM
  • Tiny
  • dcast352
  • Member

Yes, it is a 3.4L

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Tuesday, December 27th, 2011 AT 5:03 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

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.

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Tuesday, December 27th, 2011 AT 5:03 AM
  • Tiny
  • dcast352
  • Member

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.

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Tuesday, December 27th, 2011 AT 5:06 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

Yeah give me the vin that way I can tell if it came with a 3.4L

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Tuesday, December 27th, 2011 AT 5:10 AM
  • Tiny
  • dcast352
  • Member

2g1wf52e019275561

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Tuesday, December 27th, 2011 AT 5:12 AM
  • Tiny
  • dcast352
  • Member

Well idt its going through the 8th character in the vin is an E

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Tuesday, December 27th, 2011 AT 5:16 AM
  • Tiny
  • dcast352
  • Member

2g1wf52e019######

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Tuesday, December 27th, 2011 AT 5:28 AM

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