johannesblitz1
Seat Alhambra VANOS issue
Summary of the thread
A 2005 Seat Alhambra experienced a check engine light and increased fuel consumption, with diagnostics pointing to a fault in the inlet VANOS mechanics, possibly due to a defective camshaft solenoid valve or power supply issue. The problem was potentially linked to engine misfire. A similar case suggested checking the camshaft position sensor for oil sludge. The issue was resolved by replacing the choked inlet camshaft solenoid valve and performing an engine flush, which cleared the check engine light and normalized fuel consumption.
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4 comment(s)
johannesblitz1 (community.author)
Where exactly is the camshaft position sensor located, and is it easy to access? When you say 'gunked up,' are we talking about typical engine grime, or something more serious?
louisroth1
It was definitely oil sludge. The sensor is usually near the inlet camshaft, kind of tucked away. You can probably get to it, but honestly, I'd suggest a workshop. They can properly diagnose if it's just the sensor or something more serious with the VANOS system itself. Could save you a headache. Plus, they can check for any hidden BMW VANOS issues that might be lurking.
johannesblitz1 (community.author)
Took the Alhambra to a trusted mechanic, as suggested. The inlet camshaft solenoid valve was indeed choked with oil sludge. After replacement and a thorough engine flush, the check engine light is off, and the fuel consumption is back to normal. Thanks a lot for the advice!
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SEAT
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ALHAMBRA
louisroth1
I had a similar issue with my Alhambra, check engine light and all. Have you checked the camshaft position sensor? They can get gunked up, especially if there's any oil sludge.