Contour Enthusiasts Group Archives Forums General Troubleshooting YEAH! Replaced Bank 1 Upstream O2 sensor!

Sorry to waste the bandwidth, but I finally managed to replace my HO2S11 to remedy P1131:

• Put car up on ramps (mainly for insurance...All operations were done from above except as noted).
• Removed coil pack.
• Unplugged sensor.
• Put sensor socket on sensor, then 3/8" U-joint, then 3" extension, then 3/8" ratchet drive.
• Put cheater bar (16" long galvanized pipe) over handle of ratchet.
• Broke sensor loose! Glory Be!
• Started threading new sensor on by hand (this was far easier from beneath the car).
• Put socket, etc. back on, and torque sensor down.
• Plug sensor back in, reinstall coil pack, make sure no sockets left under hood.
• Reset the PCM.
• Drive with fingers crossed for the next few drive cycles!

I'll update the story once I know the CEL won't come back on... 'Til then, I'll be praying to the god of EEC-V...

Several days and city/highway drive cycles later, still not so much as a pending DTC (diagnostic trouble code) from the computer.

All that remains to be seen is whether my catalysts are up to snuff... This test takes much longer to complete. I doubt I was running rich enough for long enough to cook the cats, but we'll see.

Some keywords to make this post more search-friendly (hey, just trying to serve the CEG community ): oxygen sensor bank 1 upstream replacement P1131 rough idle CEL MIL check engine light codes O2 HEGO HO2S11 poor mileage runs rich bosch

For what it's worth, I just recently got a P0420 (Bank 1 catalyst efficiency below threshold). Reset the PCM, but it returned. Believe I'll change HO2S12 (bank 1 downstream) just for kicks before relinquishing my baby to the dealer.

Yeah, I know, if it's the cat then it's under warranty, but even in a case like this I don't want to take her in except as a last resort. Pretty sad, really... :rolleyes:

Garrick,

Wish you were closer to Florida. When the code came up that I had a bad cat at 78500 miles I took it to the dealer. Long story, but the work wasn;t done until I had 83,000 on the car. Anyway, I'm standing at the service window waiting for my car to be vrought around perusing the work order. (cost $0.) Ford replaced all three cats and the whole forward exhaust system, inlcuding all new bolts, flex pipe, etc. from the heads to the resonator!

Needless to say, I was happy.

Richard