Loss in mpg...

[BimmerWill]

Bosch 13477

Im thinking that's the part number I need but im not sure.

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[BimmerWill]

Had codes read tonight came back with p0491 and p0492 secondary air system. I took a look at the vacuum lines earlier last week but I guess I didn't do a very good job. No codes for the o2 sensors though...guess its back to the drawing board.

Would this system being bad cause me to have poor gas mileage?

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[Hornung418]

Yes. Leaky vac lines are notorious for lean codes. Check for cracks at the mating points and check that your SAP valve (thing that mounts to the head) isn't rusted open. Happens when water gets in there.

[BimmerWill]

Yes. Leaky vac lines are notorious for lean codes. Check for cracks at the mating points and check that your SAP valve (thing that mounts to the head) isn't rusted open. Happens when water gets in there.

Would this system failing namely vacuum lines cause the car to have a considerable loss in fuel mileage?

Didn't have any lean codes. Just the secondary air system ones.

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[alexandre]

Bosch 13477

Im thinking that's the part number I need but im not sure.

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Yup that's it. I actually ordered those by mistake when I was shopping... For prefacelift they're $48 ea. at Amazon. Had I known I would've shipped them your way instead of dealing with a return to Amazon USA from Canada!

For the SAP I don't know... Haven't dealt with it yet.

[BimmerWill]

Checked my vac its blowing strong. Just need to check the valve and then if that's good start scouring for the various vacuum lines on the system.

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