error codes p0301 and p0122
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error codes p0301 and p0122
My truck started missing a few weeks ago. At first it would only do it when it was cold, and only when in gear. Now it does it all the time, hot or cold, in gear or not. It's missing so hard that the entire truck shakes. It seems to go away after the truck gets driven for a few miles.
The dealer offered to read the codes for me for $100, I declined and let autozone do it for free. So, the codes are p0301 (cylinder 1 misfire), and p0122 (TPS/pedal position sensor A circuit low input). I thought this might be a breeze but the more research I do the harder it is to find anyone who has replaced the COP on the affected cylinder and had the problem fixed.
The truck has new plugs, so that shouldn't be the problem.
Has anyone here ever fixed a p0301 error? My line of thinking tells me it must be the plug, the COP, or the boot connecting the two. Most of the stuff I can find on the net has to do with people who are utterly unsuccessful at fixing the p0301 problem. I really don't want to throw a $55 part at this and not fix the problem. Any help would be much appreciated.
The dealer offered to read the codes for me for $100, I declined and let autozone do it for free. So, the codes are p0301 (cylinder 1 misfire), and p0122 (TPS/pedal position sensor A circuit low input). I thought this might be a breeze but the more research I do the harder it is to find anyone who has replaced the COP on the affected cylinder and had the problem fixed.
The truck has new plugs, so that shouldn't be the problem.
Has anyone here ever fixed a p0301 error? My line of thinking tells me it must be the plug, the COP, or the boot connecting the two. Most of the stuff I can find on the net has to do with people who are utterly unsuccessful at fixing the p0301 problem. I really don't want to throw a $55 part at this and not fix the problem. Any help would be much appreciated.
Elder User
Joined: Nov 2001
Posts: 892
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From: Duluth, MN
Swap the COP on #1 with that of #2. If the misfire moves to #2 then it is the COP. Did you use Motorcraft plugs? Autolites are junk and should not be used. it could also be a bad injector, but the only way to verify that is through an injector balance test. Or if you wanna go through the labor, swap #1 and #2 like with the COP and see if the misfire moves(but thats more work then I'm willing to do). Could be a compression issue but if all else fails, then you can work at finding that.
I see you have a TPS and pedal position sensor code, i assume you have a newer F150 with drive by wire accelerator pedal?? Could be the sensor on the pedal going bad and not sending the right signal back to the pcm? Not really sure on this one, I haven't had to do any of these at work yet....sorry
I see you have a TPS and pedal position sensor code, i assume you have a newer F150 with drive by wire accelerator pedal?? Could be the sensor on the pedal going bad and not sending the right signal back to the pcm? Not really sure on this one, I haven't had to do any of these at work yet....sorry
Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
Oh and COP's aren't $55 either. Try more like $80. And don't go aftermarket. We had a guy bring his 05' F250 into work the other day with a misfire he tried to fix himself with aftermarket plug, coil and injector and none of them fixed the problem. Did cylinder leak down test and was within spec.... Goes to show go with what the manufacturer used unless your going to change everything. they used those specific parts for a reason!
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Wilber,
Thanks for the insight. The COP I bought IS an aftermarket part. I bought it at Autozone, it's whatever they sell. I've got new bosch plugs in the truck. It's a 2001 F150.
I tried to do as much research as I could using internet resources and I think that research has convinced me to take the truck to the dealer tomorrow. It seems like this p0301 code could mean anything from a COP to an O2 sensor to a catalytic converter problem. I think this will be reimbursable under the extended warranty I bought when I got the truck.
I like the idea of moving the COP and see if the error code moves. Very ingenious.
Thanks again.
Thanks for the insight. The COP I bought IS an aftermarket part. I bought it at Autozone, it's whatever they sell. I've got new bosch plugs in the truck. It's a 2001 F150.
I tried to do as much research as I could using internet resources and I think that research has convinced me to take the truck to the dealer tomorrow. It seems like this p0301 code could mean anything from a COP to an O2 sensor to a catalytic converter problem. I think this will be reimbursable under the extended warranty I bought when I got the truck.
I like the idea of moving the COP and see if the error code moves. Very ingenious.
Thanks again.
Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
I work on these alot, and we do it all the time to verify misfires. We also have laptops to do the injector balance tests. This is one of the more comon MIL lights we see. I'de say get the OEM COP and put Motorcraft plugs back in it and that should fix it. There's always the possibility of an injector, but if u do the coil swap and it moves, u know thats what it is....
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Freshman User
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I wound up having the dealer do the work as I have an extended warranty. They replaced the number 1 cylinder coil, the Throttle Position Sensor, passenger side window motor, and fuel sending unit. All I had to pay was $254...warranty covered the rest.
The gripe of it is I had to do without my truck for 5 days, then they give it back to me and my fuel gauge doesn't work. I have to bring my truck back so they can drop the gas tank again and fix the problem.
The gripe of it is I had to do without my truck for 5 days, then they give it back to me and my fuel gauge doesn't work. I have to bring my truck back so they can drop the gas tank again and fix the problem.
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