2006 Chevrolet TrailBlazer - Codes

po171,po300,p1133 need help

Vacuum leak

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Find and repair your vacuum leak and the other 2 codes should go away.


This is a very cool post. Shows just how helpful the members can be.

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Describe circumstances leading up to problem. Has anything been serviced on the engine or fuel system recently?

why does the general consensus so often seem to be “lean codes = vacuum leak” . . . ?!

I can think of plenty of instances where that wasn’t the case

Just like an evap leak code isn’t always because of the fuel filler cap

diagnosis . . .

There was not much to go on with the problem description. There are other things it could be, but a vacuum leak is the highest probability.