Check Engine light-code #P0401
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- Posts: 77
- Joined: July 18th, 2016, 9:50 am
- Location: Goffstown, New Hampshire
Check Engine light-code #P0401
Anyone having problems with check engine light? I've replaced EGR valve, EGR sensor & checked the two hoses for leaks. I've reset the light but keeps coming on after about 100 miles.
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- Posts: 28
- Joined: June 19th, 2016, 9:16 pm
Re: Check Engine light-code #P0401
A lot of information to be found here:retiredtim wrote:Anyone having problems with check engine light? I've replaced EGR valve, EGR sensor & checked the two hoses for leaks. I've reset the light but keeps coming on after about 100 miles.
https://www.google.com/webhp?sourceid=c ... code+P0401
Re: Check Engine light-code #P0401
We did have a check engine light issue on our trip this summer to the Gaspe Peninsula of Quebec. After reading the manual, I thought it was an indication of low octane gas (Canada does not measure octane by the dual method that we do. So, I switched from the usual 87 to a higher octane. After a couple of hundred miles, it went out...so I figured that I was all set.
BUT, on last trip out to Ohio in September, it came on again, and stayed on. So, I took it to a Ford dealer in the Youngstown area, and they quickly diagnosed it as a corroded line from gas tank to the on-board generator that was leaking ever so slightly (even showed it to me). Replacing the line entailed dropping the gas tank, so it was NOT cheap...$1,000+ all-in. They also replaced a sensor (can't remember which one, but I have the slip out in the Rig if you want/need to know). Has been more than three more weeks of constant travel and I have not had any check engine light (or other) issues.
Hope this helps.
David
BUT, on last trip out to Ohio in September, it came on again, and stayed on. So, I took it to a Ford dealer in the Youngstown area, and they quickly diagnosed it as a corroded line from gas tank to the on-board generator that was leaking ever so slightly (even showed it to me). Replacing the line entailed dropping the gas tank, so it was NOT cheap...$1,000+ all-in. They also replaced a sensor (can't remember which one, but I have the slip out in the Rig if you want/need to know). Has been more than three more weeks of constant travel and I have not had any check engine light (or other) issues.
Hope this helps.
David
Re: Check Engine light-code #P0401
I've had a number of #P0401 codes as well. And I've also had EGR work done, but that didn't seem to change anything (grrr). So far no-one has been too interested in diagnosing/repairing it, but it bugs me. I also get #P0455. I'll be in a place this winter where there is a mechanic I trust to work on it (these codes don't bring drivability issues, but of course still want to fix issues).
I can clear the codes with the ScanGauge. That doesn't mean the problem goes away of course, but it can be helpful to see when they come on as a diagnostic. In my case it seems to have something to do with heavy vacuum use (i.e. accelerating up hill while towing with A/C on).
I didn't say anything when you first posted because I didn't have any really good info to share, and was hoping someone else would respond with some (as I have the same questions!).
David: Did you get the #P0401 code or was it just "a code" (i.e. check engine light) that you couldn't tell the number of (you need a ScanGauge or similar reader to actually see what code it is). I just wondered because if it's a different code then it's likely totally unrelated, but of course if it IS #P0401 (or #P0455) then it's applicable.
I can clear the codes with the ScanGauge. That doesn't mean the problem goes away of course, but it can be helpful to see when they come on as a diagnostic. In my case it seems to have something to do with heavy vacuum use (i.e. accelerating up hill while towing with A/C on).
I didn't say anything when you first posted because I didn't have any really good info to share, and was hoping someone else would respond with some (as I have the same questions!).
David: Did you get the #P0401 code or was it just "a code" (i.e. check engine light) that you couldn't tell the number of (you need a ScanGauge or similar reader to actually see what code it is). I just wondered because if it's a different code then it's likely totally unrelated, but of course if it IS #P0401 (or #P0455) then it's applicable.
1999 Concourse