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Volkswagen Passat: 1998-2005 (B5) Passat 1.8T AWM engine - 7 error codes

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Last Post: Mar 27, 2008 9:43 PM Last Post By: FKH161
Techi

Posts: 2
Registered: 03/26/08
Passat 1.8T AWM engine - 7 error codes
Posted: Mar 26, 2008 12:29 PM
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I have got the following codes yesterday:P0170, P0171, P0300, P0301, P0302, P0303, P0304. I have a secondary air pump hose that is broken. Can it cause it? I also had timing belt replaced a few weeks ago. Not sure if it's related. Any recommendation on where to start?

Message was edited by: Techi
FKH161

Posts: 7,538
Registered: 12/29/05
Re: Passat 1.8T AWM engine - 7 error codes
Posted: Mar 26, 2008 3:33 PM   in response to: Techi in response to: Techi
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Check that all the intake hoses are on correctly... you
might have a vacuum leak some where.
honest lou

Posts: 202
Registered: 12/11/04
Re: Passat 1.8T AWM engine - 7 error codes
Posted: Mar 26, 2008 6:10 PM   in response to: Techi in response to: Techi
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Random misfire (P0300, 1,2,3,4 are misfires on all four cylinders. P0171, P0170 (lean system). I would check:

Check Mass Air Flow Sensor (G70)

Check Fuel Pressure Regulation

Check Fuel Pump

Check Injectors

Check Intake System for Leaks

Check Exhaust System for Leaks

Check Secondary Air System for Leaks

Check Vacuum hose for Leaks

Mass air flow might be the first check. Use VAC Com to see what kind of air flow what the sensor is seeing. They are a high failure rate item. VW usually has them priced pretty reasonable. I would recommend diagnosing the problem rather than wholesale replacing parts. You might also have a big vacuum leak or unmetered air entering the intake system.
Techi

Posts: 2
Registered: 03/26/08
Re: Passat 1.8T AWM engine - 7 error codes
Posted: Mar 27, 2008 11:29 AM   in response to: Techi in response to: Techi
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Replaced Mass Air Flow filter and it runs great now! Thank you.
FKH161

Posts: 7,538
Registered: 12/29/05
Re: Passat 1.8T AWM engine - 7 error codes
Posted: Mar 27, 2008 9:43 PM   in response to: Techi in response to: Techi
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Good stuff!
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