Petrol Diagnostics: VW Polo 2002 1.2 16V AZQ. Code P0172

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VW Polo 2002 1.2 16V AZQ. Code P0172 Archived Message
Posted by Joe McGeoghan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5290' width='330' height='300' border=0 style='border:none;'> on September 1, 2008, 4:24 pm
Hope someone can help?
P0172 (16556 VAG) Bank 1, system too rich.

Have renewed pre-cat O2 sensor.
Have substituted MAP, similar readings.

Oil level,etc ok. No vacuum leaks, have checked evap valve. Pre-cat sensor stuck at 1.25v idle and cruise, will drop when engine revved, then return to 1,25v. CTS readings ok 95 degrees+.

LTFT @ -21%. STFT -1% even with breather hoses disconnected. Code returns as pending after approx 5miles. Have disconnected ECU to reset adaptions, etc. Vacuum 21" Hg @ idle. Smoke tested-ok,30kPa abs live data. Throttle body clear and aligned.

Plugs, oil, etc new. Injection duration seems to flicker between 1.03 & 2.06 ms @idle, steady 1.03ms @1600 RPM.
Car has covered approx 30,000 miles - seems to drive ok for a horrible three-pot, so haven't checked cam timing.
Don't have access to tool to check fuel pressure at the moment...

Any ideas? Have access to VAGCOM, Autologic, AD, etc.

Regards,

Joe

Message Thread:

VW Polo 2002 1.2 16V AZQ. Code P0172 - Joe McGeoghan September 1, 2008, 4:24 pm
Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - jmccallum September 1, 2008, 5:46 pm
Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - Joe McGeoghan September 1, 2008, 7:46 pm
Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - john weddup September 2, 2008, 7:16 am
Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - Joe McGeoghan September 2, 2008, 8:06 am
Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - Joe McGeoghan September 2, 2008, 8:24 am
Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - john weddup September 2, 2008, 8:37 am
**FIXED*Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - Joe McGeoghan September 2, 2008, 2:20 pm
Re: **FIXED*Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - JMCCALLUM September 2, 2008, 2:47 pm
Re: **FIXED*Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - Joe McGeoghan September 2, 2008, 2:52 pm
Re: **FIXED*Re: VW Polo 2002 1.2 16V AZQ. Code P0172 - Joe McGeoghan September 2, 2008, 5:38 pm