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Codes P0171 and P0174, EVAP monitor not set?

Tiny
KFLYNN702
  • MEMBER
  • 2003 LEXUS ES 300
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 209,000 MILES
Check engine codes p0171, p0174, mass air flow brand new, checked vacuum hoses, changed air filter. Evap monitor shows incomplete after drive cycle, it's the only monitor left.
Saturday, November 16th, 2024 AT 1:44 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
Hi,

How many miles was it driven? It may still be in process. Also, if you cleared the codes, did it return? If not, then continue driving it. If there is a problem, the engine light and code should return.

Let me know.

Joe
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Saturday, November 16th, 2024 AT 7:27 PM
Tiny
KFLYNN702
  • MEMBER
  • 2 POSTS
After I cleared codes did about 130 miles, check engine came on after shutting down and restarting.
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Saturday, November 16th, 2024 AT 8:36 PM

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