VW Polo EPC Light Fix https://www.ionhowto.com/epc-light-on-vw-polo-mk4-9n/
How to fix the EPC warning light on a Volkswagen VW Polo 9N (2003 model).
Engine code: AZQ
VW EPC Light Car Shaking in VW Polo 9N 2003 1.2 AZQ Check Throttle body connector. Throttle goes up and down.
Remove the throttle body connector from the throttle body housing and re-insert it into the throttle body.
When you reinstall the connector make sure it clicks back in place so it does not get unplugged or loose while you are driving.
No tools needed, no spray needed and nothing else needed other than your hands.
Do this if the EPC warning light stays on https://youtu.be/nPE0NM_VOg4
The throttle body connector is responsible to send to the car ECU data about the throttle position using the throttle positioning sensor.
Multiple sensors work together to feed the car ECU real-time data about the state of the throttle body flap.
The throttle body flap adjusts the amount of air intake into the engine and this mixed with the fuel injectors and ignition system makes the car engine rev-up or down as you press the gas pedal.
Long story I know but I like these things haha.
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The problem is while driving, the EPC light turns on and the car runs poorly. The fuel trim becomes rich. It smells like petrol behind the car. This is the limp home mode that allows you to drive the car home.
If you stop the engine, the EPC warning light might go away or stay and after turning the ignition on in the car, the engine keeps revving up and down while in idle. The car cannot be driven at this point and it must be fixed.
These symptoms together with the EPC light and OBD2 scanner or VAG-COM error codes related to the throttle body mean there is an error with the throttle body itself which can be expensive or with the electrical wiring near the throttle body.
At this point it's a good idea to check the electrical connections on the throttle body. Steps shown in the video. You can use WD-40 to spray on the connector before re-inserting it but if you are on the road and don't have spray, it's enough to remove and re-insert the connector to improve electrical contacts connection.
After you get back home, you can check VAG-COM VCDS Engine codes for throttle positioning sensors.
Engine faults found with the OBD scanner
17580 - Angle Sensor 2 for Throttle Actuator (G188) Signal too Low
P1172 - 35-10 - - - Intermittent
17952 Throttle Actuation Potentiometer Signal too High
P1544 - 35-10 this one is also Intermittent
Chapters:
0:00 EPC Light Problem
0:25 EPC Light and RPM going up and down on engine start
1:25 How to Fix the EPC Problem on VW Polo 9N engine revving by itself
1:38 Drive-by-wire throttle body
1:52 Unplug and Re-Insert Electrical connector wiring
2:19 Check if EPC light is gone and engine runs smoothly
2:50 Why the EPC light problems can happen
Watch the video carefully without skipping to see all the steps needed in this video.
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