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Check eng light

Tiny
RONALD GABRIEL
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 99,000 MILES
P430 code new cats and new sensors. Light still comes on with that code at app 120 miles. Can a bad egr valve effect that. Or any other ideas of what going on Tahoe runs okay except for light?
Tuesday, April 30th, 2013 AT 4:10 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for an air leak between first O2 and last O2 sensor. Or from engine to back
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Tuesday, April 30th, 2013 AT 5:42 AM
Tiny
RONALD GABRIEL
  • MEMBER
  • 2 POSTS
No leaks can the egr being bad cause this
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Tuesday, April 30th, 2013 AT 9:32 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It cold check that for being plugged opn or a clogged passageway or leaking air
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Tuesday, April 30th, 2013 AT 9:56 AM

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