Question about 2001 Audi TT

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Service light came on, connected a scanner and got

My 2001 audi TT quattro Service light came on, connected a scanner and got Po411 secondary air injection incorrect upstream flow detected, however there was not any noticeable performance differance

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  • Michaelkrews May 11, 2010

    My scanner printout and problem is the same. I live in a state where there are no emissions testing. Will not fixing it cause any damage to the turbo system or the manifold over time? If so, how much time? I erased the Check Engine Light code and I hope it doesn't just reappear when I start it up tomorrow morning in the cold.

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There won't be - the secondary air injection system is strictly for cold-start emissions. You won't see any effects in driving, but if you have any sort of emissions check in your state's inspection, you will fail.

Posted on Nov 19, 2009

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1 Answer

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The first fault code do you mean p1296 if so that is a cooling system malfunction you will need to check the temperature sensor.

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Funny that they changed the temp guage sensor....known problem on pre-2001 Audi TT and VW engines. Maybe yours was an early build 2002, so they helped you avoid a future problem.
As for the air flow, another known problem is the MAF (mass airflow) sensor. Don't panic, as this is a do it yourself job. Very likely problem if you ever installed a K&N type aftermarket air filter. These oiled filters cause buildup on the sensor. Free fix is to take the sensor body off (its the big ring/pipe coming off the air filter box before the rubber air intake hose) and clean the senor with isopropyl alcohol. Sensor body comes off by loosening the hose clamp on one end, and two screws into the filter box on the other. Don't forget to release the wiring harness plug by gently releasing the tab with a flat head screwdriver.
If your not comfortable with the cleaning, just find the MAF part on-line...about $200 bucks for a new one from Bosch. Very easy to do it yourself and a common failure point on the Audi.
For those still having the coolant sensor problem, also easy to replace yourself....about $10 bucks with a new o-ring.
Like GURU said, a code reader tool will tell if you have these problems, after the engine light comes on.

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Secondary AIR System Incorrect Upstream Flow Detected

Possible cause:
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