Check eng light

1999 CHEVROLET TAHOE
99,000 MILES
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RONALD GABRIEL
  • MEMBER
  • 2 POSTS
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?
Apr 30, 2013 at 4:10 AM
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HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
check for an air leak between first O2 and last O2 sensor. or from engine to back
Apr 30, 2013 at 5:42 AM
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RONALD GABRIEL
  • MEMBER
  • 2 POSTS
No leaks can the egr being bad cause this
Apr 30, 2013 at 9:32 AM
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HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
it cold check that for being plugged opn or a clogged passageway or leaking air
Apr 30, 2013 at 9:56 AM
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