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I was getting the following codes on the car please help

Tiny
DCAST352
  • MEMBER
  • 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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Tuesday, December 27th, 2011 AT 4:49 AM

19 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 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
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The car looks like this.
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Tuesday, December 27th, 2011 AT 4:56 AM
Tiny
DCAST352
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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
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Yes, it is a 3.4L
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Tuesday, December 27th, 2011 AT 5:03 AM
Tiny
SATURNTECH9
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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
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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
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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
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2g1wf52e019275561
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Tuesday, December 27th, 2011 AT 5:12 AM
Tiny
DCAST352
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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
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2g1wf52e019######
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Tuesday, December 27th, 2011 AT 5:28 AM
Tiny
SATURNTECH9
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Do you have a scan tool that can read live data and can read the fuel pressure sensor and cam sensor readings?
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Tuesday, December 27th, 2011 AT 7:31 PM
Tiny
DCAST352
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No I do not.
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Tuesday, December 27th, 2011 AT 8:13 PM
Tiny
SATURNTECH9
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With the p0440 you will need it and with the P0341 you use it to see the readings of the cam sensor for the very first steps of the trouble tree. With the P0440 you use to see if you have a issue with the fuel tank pressure sensor readings or you have a issue with your evap system.
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Tuesday, December 27th, 2011 AT 8:23 PM
Tiny
DCAST352
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Will you send me a link to one?
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Tuesday, December 27th, 2011 AT 8:28 PM
Tiny
SATURNTECH9
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A scan tool that can read those sensors?
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Tuesday, December 27th, 2011 AT 8:37 PM
Tiny
DCAST352
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Yes
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Tuesday, December 27th, 2011 AT 8:38 PM
Tiny
SATURNTECH9
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To get a scan tool that would read those would be very expensive. Lets start with code P0128 I posted the trouble tree for it. Its usually a bad thermostat let me know what you find.I will keep working on the scan tool issue.
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Wednesday, December 28th, 2011 AT 7:55 PM
Tiny
MAILIBU1955
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Satuntech9, can you help me with a check engine light problem? I have a 2006 Chev. LTZ with a 3.9 engine. Thanks, Bob
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Thursday, February 2nd, 2012 AT 9:37 PM
Tiny
SATURNTECH9
  • MECHANIC
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Malibu1955 have you started your own question yet?You need to start your own question and I will be more then happy to help you out. Just start with the this one is for saturntech9.
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Thursday, February 2nd, 2012 AT 11:15 PM

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