Emission Test

TOOTSIE

MEMBER
VOLVO 850

1996 Volvo 850 GLT failed NO (PPM) test. Limits at 15 MPH are Max 430, Average 57. Measured at 534. Everything else passed otherwise. Mechanic replaced spark plugs & battery. He now wants to change the catalytic converter. Could this have been the problem? We have put quite a bit of money trying to get the darn car to pass smog already.

1 Reply

2CARPRO JACK

MECHANIC
11,533 POSTS

Nox is exhaust temp. Be sure the egr system works if so equipped. If not could be a mixture problem(lean) try oxygen sensors the go to the Mass Air Flow Meter

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Tuesday, September 12th, 2006 AT 5:35 PM