Heated 02 sensor -- Fuse location? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

r0ckf0rd · 09-21-2007, 18:48

Car: 2000 Ford Crown Vic Police Interceptor
Mileage: 114K

Greetings!

A few weeks ago the Check Engline light came on. This happened approx 1 week AFTER the car got a new set of coils & Plugs. A scan of the computer revealed the following codes:

P0135 & P0155. I took the car back to the mechanic & he said the o2 sensors looked ORIGINAL and could use a swap.

I picked the car up yesterday, ran great for about 2 miles and the Check Engline light came back on. Ran the codes and the same 2 appeared. Cleared the computer, made it halfway around the block & the codes showed up as pending (no check engine light).

The only thing I can think of is a fuse blew out on it, and the fuse was never replaced, or there is something else going on. My questions are:

1. Is there a fuse for the 02 sensors? If so, where is it?????

2. What else would be causing this to come up? The codes have to do with the heat sensor not heating up in time.. The car still runs OK, but I notice a drop in acceleration when the codes comes up as pending, or the CEL comes on.

I know that there is a slight chance of having 2 bad oxygen sensors, but that seems a bit extreme. If it was the coils or plugs, I'd think I would get some hesitation or something, but the car runs and idles smoothly.

Stumped!!! If there is a fuse, please let me know where and I will look into it this weekend.

Thanks!

Andy

fordracingedie · 03-04-2008, 16:15

Hey I have a 94 mustang gt and the same fuse keeps going out, it says on my manual that it is the H02S heated O2sensors. What could be the problem my check engine light comes on after 2 minutes of driving everytime and it is driving me nuts seems to be running rich also i think it is the 02s that are bad any replys???? Oh yeah no codes come while scanning i guess since the CEL doens't turn on and it doesn't store the code it pretty weird.

Victor 152 · 03-07-2008, 21:07

Andy,

I looked through the wiring diagrams for my 2005 CVPI and yes there is a fuse for the heated O2 sensor. On the 2005 it is located in the Battery Junction Box, fuse number F1.21 and it is 15 amp rated. Hope this helps.

Mike