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Instructions for Replacing Spark Plug Cap

Model: Volkswagen Polo MK IV, Polo IV, Polo 4, MK 4, 9N - Years 2001-2009
Part: Checks and maintenance

If you experience problems during engine starting and the idle speed is very irregular, there may be a detonation issue in one of the cylinders due to a faulty spark plug or coil; if the engine warning light also comes on, you can perform a diagnosis to check for fault codes: in this case, the third cylinder's misfire is indicated (cylinders are counted from the timing belt). Proceed to replace the complete cap with ignition coil by disconnecting the connector, removing the old cap, and inserting the new one to which you will connect the connector.

Updated on 14 February 2026 by ScegliAuto

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