Passat High Idle.

[tommyk]

Hi all,
I have a '97 1.6 petrol passat - the first of the newer shapes. Anyway, recently it has started to idle very high (around 3400rpm) after a few minutes driving, before the engine gets up to operating temperature. I checked for any air leaks, but can fault none of the pipes.
I got the loan of a code reader today and it came up with
"00515 Hall Sensor G40"
Looking around the internet, including this site, it seems to be the cam sensor - I didn't think a cam sensor would be able to throw the idle off as much as that though!
Has anyone had similiar experience?!
Thanks in advance.

[martin1810]

The hall sensor tells the ecu about cam timing so the wrong signal could lead to poor running. A vag-com read will give you 00515 plus a better desription of the fault e.g. open circuit, wrong resistance etc. The test is to replace it with a known good one. Easy if you happen to have a mate with the same car. Guess you may have to buy one to find out.

[tommyk]

I didn't think it would cause the engine to idle so high though! It takes a bit to start is, which is understandable.