intermitent loss of boost pressure

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01-22-2003, 10:35 AM

Italo Metto

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intermitent loss of boost pressure

check engine light on,intermitent boost pressure. Sometimes only 5lbs sometimes up to 18lbs. Please, what could this be??

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01-22-2003, 10:45 AM

DarinS4Turbo

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Possibly a boost leak which when detected puts the car in limp (5psi) mode. When you start the car

again it resets, which is why you may see 18psi again, but if it detects something wrong (boost not rising fast enough or keeping with expected values) it will flip back to limp mode or 5psi.

Do you have a VAG tool or know anyone with one to confirm what code you are seeing?