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High CO
Smog Check & Emissions Questions and Answers
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Question
Answered
Should our 1976 GMC Pickup have a catalytic converter?
by
Christina
Yes (1)
1989 Mitsubishi Galant. Failed smog check for high NO (PPM) emission. Max 559, Meas 635
by
myrna
Yes (1)
1991 Lexus LS400 failed test smog test for high HC.
by
krk
Yes (1)
1993 Isuzu Trooper has high CO, check engine light not on, and it failed the smog test.
by
ram
Yes (1)
What repairs might be necessary for a 1993 Chevy S-10 Pickup with 195,000 miles that failed the test
by
Kaitlyn
Yes (1)
1988 BMW 325i - the emissions control systems visual inspections/functional check results passed
by
Lauren
Yes (1)
1997 Oldsmobile Aurora 4.0 Northstar failed smog test for high HC.
by
Randy
Yes (1)
1992 GMC Suburban 2500 has high CO because of loose spark plug.
by
ray
Yes (1)
1995 Nissan 200sx with manual transmission and high mileage failed smog check for high HC, CO, and NOx.
by
Joe
Yes (1)
1997 Jeep Wrangler failed smog test for bad oxygen sensor and check engine light on.
by
anthony
Yes (1)
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