check egine light on and off
#1
check egine light on and off
The check engine light come one about 6 days ago so i went and got it read and it has a p0420 code. The man at autozone suggested some fuel cleaner or omething like that so i put some init and about 30 miles or so the light went off. Well today i went to the bank and s i leave i turned the key and it wouldnt start, turned key again still wouldnt start so I turned the key all the way off ad then it starte and the check engine light came on again, rode around town for maybe20-30 min and the light went off as i was on the way home. Any advice on how to resolve this issue?
05 screw fx4
05 screw fx4
#3
#6
yes it can be....
but from history's sake not always...
bad o2 sensers
exhaust leaks
vacuum leaks
dirty/fouled maf
there's a lot that can contribute to this code....
and since the op's truck is a 2005 this could also be a contributor>>> https://www.f150online.com/forums/v8...ram-07m08.html
but from history's sake not always...
bad o2 sensers
exhaust leaks
vacuum leaks
dirty/fouled maf
there's a lot that can contribute to this code....
and since the op's truck is a 2005 this could also be a contributor>>> https://www.f150online.com/forums/v8...ram-07m08.html
Last edited by 88racing; 06-12-2012 at 03:14 PM.
#7
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#9
From my book.....
Causes
A code P0420 may mean that one or more of the following has happened:
Leaded fuel was used where unleaded was called for
A damaged or failed oxygen sensor (HO2S)
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure
Cylinder misfire
Oil contamination
Possible Solutions
Some suggested steps for troubleshooting a P0420 error code include:
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2S), replace if necessary
Replace the catalytic converter
Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily.
We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter.
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
A code P0420 may mean that one or more of the following has happened:
Leaded fuel was used where unleaded was called for
A damaged or failed oxygen sensor (HO2S)
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure
Cylinder misfire
Oil contamination
Possible Solutions
Some suggested steps for troubleshooting a P0420 error code include:
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2S), replace if necessary
Replace the catalytic converter
Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily.
We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter.
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
#15
At this point in time I would highly recommend that you bring your truck to a certified Ford dealer....if you have less than 120,000 miles on your truck and its a 2005 5.4 3v.......let them check your injectors and if there's a bad one the cat should be covered also....
The only bad thing is if a bad injector is not found you're responsible for the diagnostic fee...
please read this link>>> https://www.f150online.com/forums/v8...ram-07m08.html
read the pdf link in the first post of the thread....
The only bad thing is if a bad injector is not found you're responsible for the diagnostic fee...
please read this link>>> https://www.f150online.com/forums/v8...ram-07m08.html
read the pdf link in the first post of the thread....
Last edited by 88racing; 06-15-2012 at 05:50 PM.