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2002 GMC Envoy Service Engine Soon

Tiny
KHLAIFAT
  • MEMBER
  • 2002 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
One month ago I had the "Service Engine Soon" light coming out in my 2002 GMC Envoy. I had driven the car to the repair shop. The diagnose was "EVAP system error", they conficed me that such type of problems is caused by oxygen sensor. After changing the ogygen sensor, the light is still on and even stronger (lighter). I was provided by too many guesses for the cause of the problem. Can you help me guys to find out why the "service engine soon" is still on?
Thanks in advance
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Saturday, January 3rd, 2009 AT 11:42 AM

3 Replies

Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
What was the code? An 02 sensor will not cause an evap code, how did the repair shop diagnose it? Were they guessing?Need to monitor evap data with a scan tool or put a evap smoke machine on it.(It fills the the sys with nitrogen and smoke to find a leak). Post back with the code and will advise from there.
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Saturday, January 3rd, 2009 AT 1:32 PM
Tiny
KHLAIFAT
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  • 2 POSTS
The code is P0440 (evap system error).
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Monday, February 2nd, 2009 AT 5:36 AM
Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
Have the evap sys tested with a smoke/nitrogen machine to find the source of the leak.
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Monday, February 2nd, 2009 AT 10:27 AM

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