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2001 Toyota Tacoma Check Engine light is on

Tiny
GSHEPHARD
  • MEMBER
  • 2001 TOYOTA TACOMA
  • 2.7L
  • 4 CYL
  • 4WD
  • MANUAL
  • 285,000 MILES
I have a scanner, the three codes are p0125, p0420 and p1130. The rear sensor o2 is new, is an OEM denso. The front o2 sensor is 2 years old, is a bosch. The cat is about 2 years old and is after market.

I have recently cleaned the MAF and air filter and changed spark plugs. No other codes ever show except infrequently a lean mixture code.

After being cleared, check engine light stays off 2-4 days and then comes back on.

Any help would be appreciated.

Thanks.
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Monday, November 2nd, 2015 AT 9:44 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
420 code is a converter so it may be that as you said you replaced 2 yrs ago but didn't put mileage replaced. Or it's an air leak prior to converter. 125 is a coolant temp problem so it may be a bad ect sensor. 1130 is air fuel mix is lean so check fuel pressure with a gauge which you may need an adapter so a pro may have to do this. Should be 38-44 psi must meet minimum number at idle
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Tuesday, November 3rd, 2015 AT 6:18 AM

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