Service engine light on Ford E-250 5.4?

ROSS GARLAR

MEMBER
1998 FORD EXPLORER

What would cause the "service engine light' to continue to be on? I ran a obd code retreival and it came up " bank 2 too lean" I put all new o2 sensors in the crossover / exhaust pipe and still get the code and light on. Any ideas what else it could be?

3 Replies

DRCRANKNWRENCH1

MECHANIC
3,435 POSTS

It could be the fuel pump or the fuel pressure regulator.
There could also be an exhaust leak near any of the oxygen sensors that is picking up on the leak and reading lean.
I would manually test the fuel pressure, Adavance and Auto Zone have the test tool on loaner.
Inspect the exhaust for cracks or leaks.

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Thursday, May 24th, 2012 AT 12:17 PM

TINGWEI

MEMBER
2 POSTS

You need to check the wires that go to the sensors real good, and make sure ever who erased the codes of did it right, if not they will still be in the computer, you also have to drive one a certain distance so everything can re-set, this happened to me once, and all I had to do was drive it a while and the light went out, but be sure and check the wires for the sensors they can be damaged and cause this to happen, good luck with it
Also a misfire an cause the light to come on for lean codes also.

But without freeze frame data (It's one of the menus on most OBD II readers but places like the zone don't know how to run anything except codes) I can't narrow it down yet. Sorry

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Friday, May 25th, 2012 AT 1:30 AM

DRCRANKNWRENCH1

MECHANIC
3,435 POSTS

Some OBD readers do give more conclusive data than others. You might try going to a repair shop and they won't charge much as it takes so little time, but it may well be worth it to get the information from a better scanner.

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Saturday, May 26th, 2012 AT 1:11 AM