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View Full Version : Please Help VW Polo 2002 9N 1,4 16V AUA error codes HELP me please!



roobarb90
02-04-2014, 10:46 AM
I have the car in the thread title, and it's not idling as it should, and it has a couple of error codes.

When pressing the clutch, it sometimes stalls and turns off. It can "bounce" between 500-1200 rpm 2-3 times until it stays around 700. If you then rev to 2000rpm and release it, it sometimes stalls, and sometimes starts "bouncing" as low as 4-500rpm (I suspect it compensates with gas)

The stored error codes are:
P0171 System too lean bank 1
P0140 O2 sensor circuit no activity detected bank 1 sensor 2

I also had this code stored:
P0402 Exhaust gas recirculation "A" Flow excessive detected
but it seems to have disappeared by itself now

I also have P0171 as pending error code.

So far I have only changed the fuel filter and air filter, as well as the spark plugs.

I have googled a lot on the P0171, and it seems like the most common issues are leaks in the vakuum hoses. I can't visually see any leaks, and I have sprayed a little bit of engine starter around the vakuum hoses, without it doing anything to the engine rpm. I have also cleaned the throttle body.

Could it be a faulty EGR-valve? Or perhaps bad intake manifold gaskets or something like that?

Nagaho
05-03-2015, 02:37 PM
It looks like from these likely causes could be:


Leakage in Intake and/or Exhaust System
Catalyst faulty
Oxygen Sensor(s) faulty
Oxygen Sensor(s) Control faulty
Exhaust Gas Recirculation (EGR) Valve stuck open/leaking/faulty
Exhaust Gas Recirculation (EGR) System leaking/faulty
Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve faulty
Mass Air Flow Sensor (G70) defective
Intake System Leak(s)