Thread: Z3 Immobilised
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Old 7th February 2019, 15:39
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Hi Ian

Ive had this exact problem twice on Z3's

On a 3.0 facelift it was the MAP sensor, bought a cheap replacement off ebay. Fixed it but only lasted 2 months. Bought a Bosch one, to my knowledge still going strong years later.

However as yours is the pre-facelift going by the type of immobiliser this is what happened. Start but not run. BMW technician said he thought it was the KWS II box,charged £125. Not that.

Had an auto locksmith came out and cut two new keys and got all the keys to match the ring and immobiliser, all talking the correct language to each other. Cost £150. Not that.

Towed the car to BMW Grosvenor in Reading (BMW specialist that the main dealers use when they cant fix an electrical problem). They had it 4 days and it turned out to be the camshaft sensor. Car will start but the computer does not know where the camshaft is positioned so cuts the fuel. Cost £462 (OUCH)
If that had not cured it the crankshaft sensor was next to be replaced as that would cause the same reaction.

Hope this helps
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