Focus Fanatics - View Single Post - Troubleshooting fuel mixture
View Single Post
Old 11-07-2012, 06:44 PM   #1
Farking_farkus
Focus Rookie
 
Join Date: Jan 2012
Fan#: 93893
Location: Indiana, IN
What I Drive: 2003 wht LX

Posts: 2
FF Reputation: 1 Farking_farkus Good Standing Member
Buy-Sell-Trade Rating: (0)
Troubleshooting fuel mixture

I have a P0420 code (insufficient cat efficiency) and am trying to isolate the problem. Car idles, drives fine. I do hear very slight emission backfire at 40-50 mph, but hardly can hear it over the radio. I replaced wires, plugs, coil pack recently, and I'm gonna check the injectors tomorrow (with ohmmeter). I think the fuel mix may be a tad rich. Any other suggestions? From what I've read, the O2 sensor is usually not an issue.

http://www.obd-codes.com/p0420


__________________
'03 Silver SE 155K SOHC
Farking_farkus is offline  
    Reply With Quote