Po171

1998 TOYOTA TACOMA
215,000 MILES • 2.4L • 4 CYL • 2WD • MANUAL
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NUKEGUMBO
  • MEMBER
  • 1 POST
I am getting a lean code on my truck. Changed fuel filter, fuel pump, O2 changed less than year ago. fuel pressure forty two pounds when running. Here is the big question; There is no pressure with the key on engine off, could this cause the lean code/
Dec 8, 2016 at 5:59 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
lean codes are caused by a bunch of things, vacuum leaks for one. retest fuel pressure see picture for checking. it may have a bad pressure regulator on it. also, check brake booster as they can leak causing the vacuum leak.
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Dec 8, 2016 at 6:30 AM
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