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john, The Car Guy
Category: Toyota
Satisfied Customers: 16042
Experience:  ase tech over 15 years in the field
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1999 camry with 3.0 liter failed emission due to gh hc on

Customer Question

1999 camry with 3.0 liter failed emission due to high hc on low and high rpm, any idea what I could do, no check engine light all monitors are complete,
Submitted: 1 year ago.
Category: Toyota
Expert:  john replied 1 year ago.

how many miles? when was the last tune up?

Customer: replied 1 year ago.

166 k , unknown last tuneup date , just bought vehicle

Expert:  john replied 1 year ago.

first thing would be to change the spark plugs and retest