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Old 06-16-2011, 11:22 AM   #1
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Join Date: Jun 2011
Location: New Jersey
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Question Help diagnosing error codes P0463 and P0420

I've been lurking the forums for a few weeks and finally decided to submit my plight to those of know at least a little bit (but hopefully a lot) more than I do.

For the past few weeks I've had the following two error codes and I'm not 100% on the best way to approach the problems.

I have a 1998 Jeep Wrangler Sahara 4.0 with about 110,000 miles.
  • Error Code 1: P0463 - FUEL SENSOR A CIRCUIT HIGH INPUT
  • Error Code 2: P0420 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)
    • FREEZE FRAME
    • FUEL SYS 1 = CL
    • CALC LOAD = 5.8
    • ECT = 213
    • STFT B1 = 0.7
    • LTFT B1 = 7.8
    • MAP(inhg) = 13.2
    • ENF RPM = 704
    • SPEED = 0
I've read through the forums and done my research, and there could be anything from sensor issues, to fuel pump, fuel filter, to a bad catalytic converter causing the problems. I *do* have to crank the key twice for it to start 85% of the time, and it might stutter and sputter a bit, but once its running, it runs damn fine. I only drive it about 50 miles a week, but I plan on driving it until it literally falls apart on me at a nice high mileage and old age.. so I want to keep it going as long as I can without making it worse.

Any suggestions or help and troubleshooting path would be much appreciated! I'm technically and mechanically inclined, and don't mind attacking anything that's within my ability (or slightly out of my ability) to fix.. but before I take it to a mechanic and get raped in labor costs, I want to see what damage I can do first.

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Old 06-16-2011, 12:48 PM   #2
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Join Date: Jun 2011
Location: Longmont CO
Posts: 171
Start here to help find the trouble:
P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1)
I'm not clear what the 463 code is indicating, but it is likely related to the 420 code problem.
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