running rich?

reichbc

"Brandon"
I have a feeling that my P0420 code is being thron due to unburnt fuel in the exhaust. how would i go about leaning out the fuel supply?

b16a2, 99 civic si.
 

31dev31

Chillin' Canadian Member
Registered VIP
Registered OG
5+ Year Member
How's your O2 sensor?
 




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