Code 41! cODE 41!
Thread Starter
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Mountain Pass
Joined: Dec 2003
Posts: 154
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Code 41! cODE 41!
Hi I am getting a code 41 on my 88 F-150 5.0 L I have looked this up and it says HEGO. Sensor volt low,system lean. I assume this is the Oxygen Sensor that is throwing this code. My truck is awfully hard on fuel so would this be a good assumption? I know it could be a bunch of different things but would this be a good place to start?
Post Fiend
Joined: Jan 2005
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Yes, according to my list system lean, oxygen sensor not switching.
I am no expert but I would be looking for a vacuum leak, including a leaking/stuck EGR valve. Also, if it was me, if the oxygen sensor has more than 60,000 miles on it I would replace it anyway. Just my thoughts. Hope this helps.
I am no expert but I would be looking for a vacuum leak, including a leaking/stuck EGR valve. Also, if it was me, if the oxygen sensor has more than 60,000 miles on it I would replace it anyway. Just my thoughts. Hope this helps.
Thread Starter
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Mountain Pass
Joined: Dec 2003
Posts: 154
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well I think the EGR is good as I had it apart and cleaned it. It works freely so I guess it is OK. I also put a new pipe from it around the rear of the engine. I also think there are no vacuum leaks as I have checked all the lines and replaced the "soup can" It will also store vacuum long after thew vehicle is shut off. I do not in fact know if it has ever been changed. I acquired the truck with a burnt valve so it;s past history is a mystery at this point. I should say there are only 144,000 Klm or 90,000 miles on the truck.
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
With engine at idle you could try spraying carb cleaner or ether around and listening for a change in note to be absolutely sure you do not have a vacuum leak. If not then I would have thought either clogged fuel filter or low fuel pressure or defective oxygen sensor.
I guess easiest to do is replace fuel filter (unless you know it has been replaced recently) which is a good idea anyway and replace the oxygen sensor, also probably a good idea anyway.
I guess easiest to do is replace fuel filter (unless you know it has been replaced recently) which is a good idea anyway and replace the oxygen sensor, also probably a good idea anyway.
