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2001 BMW Z3 failed inspection code P0492

Tiny
GTIMMINS
  • MEMBER
  • 2001 BMW Z3
Engine Mechanical problem
2001 BMW Z3 4 cyl Two Wheel Drive Manual

just failed my inspection due to above code. States secondary air injection system insufficient flow bank 1 and 2. Can you help me out? Bmw cannot service until at least monday and my inspection expires tomorrow. Is this something my mechanic can do?
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Friday, July 30th, 2010 AT 7:07 AM

3 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
There is a small vacuum hose going to the secondary air injection valve, check it for breakage.
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Friday, July 30th, 2010 AT 7:19 AM
Tiny
GTIMMINS
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Brought it in to bmw. Was told that they need to replace the secondary air pump for $985!
I honestly do not know how a part can be broken while the car drove beautifully. How does this affect the vehicle? Wouldn't the warning lights turn on for this? I have not yet ok'd for them to order the part. Cost above is just for the part! I need to find another option. Unfortunately, I am unsure if that is the problem.
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Tuesday, August 3rd, 2010 AT 6:15 AM
Tiny
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The secondary air pump supplies pressurized air to the exhaust manifold, when the engine is first started from cold, this quickens the catalytic converters start time. The pumps have been known to fail and it will not effect driveability. I suspect it is not the pump, but the vacuum hose that controls the valve that sits at the exhaust manifold. 2001 Z3 did not have a 4 cylinder.
So going back to my earlier post about the vacuum hose If it is corrupted, the secondary air will not flow, check that next and let me know what you have found.
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Tuesday, August 3rd, 2010 AT 8:23 AM

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