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Audi TT 2000-2006 DTC #P0171

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Registered: 03/14/06
DTC #P0171
Posted: Jul 30, 2007 8:24 PM
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DTC P0171 = System Too Lean (Bank 1) - the TT service CD says check: fuel pump, fuel filter, pressure regulator, MAF, and vacuum leaks.

My 2002 TT 1.8 Quattro w/ an AMU engine runs fine, so fuel delivery seems unlikely. This code came up at the same time my Secondary Air Injection motor failed from exposure through a broken hose. New motor and new hose are on. DTC # p0171 remains.

I am going to search for a vacuum leak before considering the MAF and the pressure regulator.

Has anyone trouble shot this problem before? I assume the cluster of vacuum hoses on the SAI assembly near the intake manifold is a good place to start. Are there other places I should inspect that are prone to leaks? Does this approach seem reasonable or am I missing something?

Thanks for any insight.

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