Land Rover Repair: SES light, crankshaft position sensor, transmission control unit

Question
Hi, SES is Service Engine Light.  I've taken it to the Dealership and they say they can't find anything wrong!  ARGH!  The light won't go off still though.  And I can NOT pass the smog check.  I'm at my wits end.

Thank You,


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Followup To

Question -
Hi,

I have a 2000 Landrover Discovery II with 43K miles on it.  The SES light came on over a year ago and I've taken it to the mechanics 4 times in the past year.  Each time I've spent a chunk of change ($4000 total) and each time the mechanics have been resetting it and the light comes back on usually within the first 10 miles of driving it again.

The car runs perfectly and nobody (the mechanics) can figure out what the problem is.

The thing now is, I can't pass my smog check and I'm not driving on an expired registration sticker.

Could it be a computer malfunction?

Answer -
In my oppinion you should check the engine management system  at a LR garage. There maybe fault codes or, faulty sensors, or any other signs.
My main idea is the catalitic converter, or lambda sensor (oxygen sensor, HO2S)

Maybe through ignorance, but I don't know what is SES?!

Answer
Had the Crankshaft position sensor changed? If yes, had the flywheel adaptation resetted? It's very important!
Had the Automatic Transmission control unit checked? BeCause much automati transmission problem can lit the SES lamp!
Have you got a printed document of the fault codes, and the freeze frame datas? If yes I would see them.
You should ask for all the adaptation datas reset.
In the LR garage they've got the latest engine control unit software. Maybe a software update/reload can solve the problem.
Ask the expert to check, can the engine management get to Closed Loop Fuelling? (I's sure he will understand this)

So, the SES lamp is illuminate when some malfunction is sensed. When the management lit the lamp, it writes the causing to the memory by a fault code Pxxxx, and freeze frame datas (enviroment conditions). You should go in a garage where they have an OBD (on-board diagnostic) reader, and read these DTC-s (diagnostic trouble code). Write those codes  and datas down for me please, and I can help you more.


I know these informations are hard to understand, but then you should show these, to a car mechanic, who you trust in.

Good luck