Yes the sensor does measure the air going in to the pump, but that amount will be lowered if the air isn't able to make it into the exhaust... The main cause of this fault in the field is the vacuum line going to the valve. It is in a high heat area so gets dry/cracked over the years and odds are when you check it out it may break off in your hands, so I'd expect to change a 6" piece of vacuum hose.

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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

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X5 pics

RIP 4.6is.....

2003 4.6is