O2 heater ciccuit

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Mar 8, 2005 | 02:41 PM

iafordf150

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From: Cedar Rapids Iowa area,

O2 heater ciccuit

Hi all , this is the first time I have posted, usually find the answer somewhere in the threads but not this time. I have a 96 F-150 with 300 and 5 speed and 49K. Last week I got a MIL and it was code P0155, so I figured the heater was out of the O2 sensor so I replaced it and reset the light. Drove it today for the first time and MIL again, this time P0135,141,&155. I figure it cant be all the sensors it has to be the juice that heats the sensors, any ideas of what to do, I hate taking it to a dealer.
Thanks

Mar 8, 2005 | 07:16 PM

EPNCSU2006

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From: Concord, NC

Check all of the relays and circuit breakers/fuses to start with. I am not very familiar with the '96 trucks, so I'm not really sure what to tell you other than that.

Mar 8, 2005 | 07:40 PM

iafordf150

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From: Cedar Rapids Iowa area,

O2 sensor

Thanks for your thoughts, I had already looked for fuses, I have no idea where to look for relays or breakers. I will will check my shop Manual see if they show them or tell me where they might be located. I called Autozone and he didn't really know anything, tried to say my converter was plugged. This truck has only 49 k so I don't think it would be plugged. I had aan O2 sensor replaced at the dealership with 25K on it,same one as I replaced so something isn't right. The truck seem to be running ok so I don't think it is hurting perfomance except the first 5 or 10 min. or so.

Mar 9, 2005 | 06:25 AM

EPNCSU2006

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From: Concord, NC

The only thing I know to do is check the wiring with a multimeter to find out exactly what is going on and to make sure there are no broken wires.

Mar 9, 2005 | 07:38 AM

iafordf150

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From: Cedar Rapids Iowa area,

Thanks I will do some checking and maybe call a dealer. Truck is running good so I will take my time and try some things.

Sep 23, 2005 | 03:15 AM

tb40nd

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From: MI, USA

Quote:

Originally Posted by iafordf150

Thanks I will do some checking and maybe call a dealer. Truck is running good so I will take my time and try some things.

hey, did you ever find out what was going on with your truck?

there seems to be quite a few people getting these same codes and i've yet to see where someone has successfully diagnosed the problem.

thanx in advance.

rtb

Sep 23, 2005 | 05:53 AM

Captbo2001

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Hi,,, It seems I just had the same problems with the same codes with my 1996 Ford F150 4X4 auto, super cab. I replace all 3 O2 sensors, but my check engine light just came back on after resetting it. I checked for all the problems that the guys recomended on this board. Everything seemed to checked out OK. A scan of the OBDII did say there was a bad fault ground. When the ignition key was turned on, I was losing ground. Ford Dealer Mechanic said it was the ECU. I replaced that, and my check engine light went off after ressting it, and it has not come back on. Make sure you check all the possible problems as posted on here, then consider your ECU. I got one at Advance Auto. I looked at the old ECU and it looked in good shape from the outside, but there was some rust around the edges on one side. Maybe a contact somewhere got rusted and couldn't make a good ground. The ECU on my truck was located, on the inside of my driver side front fender. I had to take off the inner fender well to get to it. Hope this info helps.

Last edited by Captbo2001; Sep 23, 2005 at 06:01 AM.