This is a weird problem that I have not found any info for online. If the car is running with the headlights on, and you turn off the ignition switch, leaving the lights on, the engine won't shut off. You have to put the key back in the ignition and then turn off headlights then Pull out key to shut off engine. What could that be?

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Andrew Villasenor
805-720-5057
1984 300D turbo 5-speed manual(daily driver)
ALL MY DIESELS RUNNING WVO
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Any work just before the problem?

Does this car have remote start / aftermarket radio / aftermarket alarm ? Lots of odd things can occur.

Also, mice can chew wiring and cause all sorts of odd problems.

Simple solution: Turn off headlights before turning off engine.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.