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2001 Toyota MR2 125 code and 171 code

Tiny
CKNAPP360
  • MEMBER
  • 2001 TOYOTA MR2
  • 4 CYL
  • 2WD
  • MANUAL
  • 120,000 MILES
My check engine light has been off and on for the past cour of months now, it's showing up as 125 and a 171, but I think the 171 Is just a result of the 125. Have had a couple different mechanics look at it and started a thread on a forum about my car. Nobody can figure out the problem. I haven't really noticed any negative side effects but I don't like driving around with a CEL. I'm thinking maybe the O2 sensors or a dirty MAF. I was also told it could be a computer problem. Please help.
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Friday, October 8th, 2010 AT 3:04 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.
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Friday, October 8th, 2010 AT 3:09 PM
Tiny
CKNAPP360
  • MEMBER
  • 2 POSTS
But what about the 125 code? The 171 doesn't even show up thy much, it's more the 125 I'm worried about. Any thoughts?
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Saturday, October 9th, 2010 AT 4:32 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be an oxygen sensor problem
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Saturday, October 9th, 2010 AT 5:06 PM

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