Replacing a Faulty Ignition Coil - Volkswagen Polo

How to diagnose, remove and replace a faulty Ignition coil on a 2002 to 2009 Volkswagen Polo Mk4 (9N), with the 1.4 litre petrol engine, using a basic OBD 2 code scanner and phone app. If your engine has a faulty ignition coil it could cause the engine to misfire or even backfire. You may have a rough idle, lack of power, poor fuel economy and it will probably illuminate the 'Check Engine Light' on your dashboard.
Common ignition coil fault codes include:
P0300 - Random/Multiple Cylinder Misfire Detected
P0301 - Cylinder 1 Misfire Detected
P0302 - Cylinder 2 Misfire Detected
P0303 - Cylinder 3 Misfire Detected
P0304 - Cylinder 4 Misfire Detected
P0351 - Ignition Coil (A) Cylinder 1 Primary/Secondary Circuit Malfunction
P0352 - Ignition Coil (B) Cylinder 2 Primary/Secondary Circuit Malfunction
P0353 - Ignition Coil (C) Cylinder 3 Primary/Secondary Circuit Malfunction
P0354 - Ignition Coil (D) Cylinder 4 Primary/Secondary Circuit Malfunction
~~~~ Part Links ~~~~
As an Amazon Associate I earn from qualifying purchases.
🚗 Polo Ignition Coil ~ amzn.to/3Sww0O7
🚗 OBD2 Scanners ~ amzn.to/47j7Pai
Disclaimer: Screwsnutsandbolts is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to www.amazon.com
Thanks for watching. Please comment, like and subscribe !
All of my uploaded material is protected under copyright law. None of my videos may be re-uploaded, reproduced or transmitted, in part or in full, in any form or by any means, without the written permission of the copyright holder.
© / screwsnutsandbolts 2023
Read important information below:
Disclaimer:
My videos are a guide to making repairs and also to provide helpful information.
Do not attempt to make any repairs unless you’re sure you know what you’re doing. For more detailed information, if something is not clear to you, or you don't understand something, have the repair carried out by a qualified mechanic or at your local car dealer. Any repair you carry out on your car you do at your own risk.
Under no circumstances will Screwsnutsandbolts be responsible or liable in any way for any content, including but not limited to, any errors or omissions in the content, or for any loss or damage of any kind incurred as a result of any content communicated in this video, whether by Screwsnutsandbolts or a third party. In no event shall Screwsnutsandbolts be liable for any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or profits arising out of or in connection with the availability, use or performance of any information communicated in this video. Due to factors beyond the control of Screwsnutsandbolts, it cannot guarantee against improper use or unauthorized modifications of this information. Screwsnutsandbolts assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. Screwsnutsandbolts recommends safe practices when performing any do it yourself repairs and or with tools seen or implied in this video. Due to factors beyond the control of Screwsnutsandbolts, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Screwsnutsandbolts.

[@nickelilltroll6]

Thank you for the excellent video. Had to doublecheck after i changed the plugs+coolant sensor yesterday(very hard to start now during winter). Didn’t help AND now…a day later my check engine light came on with a little bit of rough idle. Ran fine after the small service yesterday…waiting for a obd tool in the mail. Any suggestions? Made sure of all were mounted correctly. Airhoses, knocksensor and so on….

[@screwsnutsandbolts]

You'll probably need to find out what code is triggering the engine light. Check out this link, it might give you some useful suggestions: uk-polos.net/viewtopic.php?t=76855

[@conorthomas1231]

Just got to 101k miles on my polo,
Got piston slap but she’s running fine apart from that,
Should I look at replacing coils as preventative maintenance? Or just wait till one goes?

[@screwsnutsandbolts]

You'd really need to diagnose exactly what's causing the slap before changing any coils

[@conorthomas1231]

@@screwsnutsandbolts Worn rings I’m guessing,
It only does it for a min or 2 and it’s not majorly loud

[@agentolshki4265]

Is it possible then that a slight fault may not trigger the light on the dashboard? Ive possibly got a faulty coil but no light has come on. new plugs didnt help. Really good figures all round on compression test.

[@screwsnutsandbolts]

Yes sometimes I found, with the VW Golf and Polo, that the faulty coil didn't cause the engine light to come on. I'm not quite sure why though.

[@Carlosmartinhox]

​@@screwsnutsandboltsHello friend, I have an error in cylinder N°3, vw polo 9n, I checked with obd2, but I would like to be sure if it is the coil... question: if I change the coil to another cylinder N°2, and the error appears on n2, does it mean I have to replace the coil? am I correct? hug🫡

[@aronbaan363]

I have the same problem