FSI Coil Conversion and ICM Delete Harness Kit 1.8T AEB ATW - Audi A4 B5 / VW Passat B5

No more misfires on your 1.8T AEB / ATW

Early Audi A4 B5 and VW Passat B5 1.8T engines use passive 3-wire coil packs driven by an ignition control module (ICM) mounted on the airbox. With age and heat, both the ICM and the coils wear out: idle misfires, stumbling under acceleration, and hours spent swapping parts to find the culprit.

This kit fixes the problem at the source. 2.0 TFSI / TSI coils have a built-in igniter: they take the ECU signal directly, so the ICM is no longer needed. You get a more modern, more reliable ignition system with coils that are easy to source.

Kit contents

• 4 coil conversion harnesses (original 3-wire connector to 4-wire coil)
• 1 ICM delete harness (bypass, fits one way only)

Also required

Coils and spacers are not included in this kit:

• 4 × 2.0 TFSI / TSI coil packs, such as our Dynaparts Plasma ignition coils
• 4 coil spacers, required to seat the TFSI coils at the correct height on the 1.8T valve cover: Dynaparts aluminium coil spacers

Benefits

• Removes the ICM, a well-known weak point of the factory ignition
• 2.0 TFSI coils: more consistent spark under high load and a smoother idle
• Allows a wider spark plug gap on tuned engines while keeping a strong spark
• Custom-made, 100% plug and play harnesses: no cutting or soldering on the factory loom
• Simple, fully reversible installation

Installation tips

• For access to the front coils, move the coolant expansion tank, the MAF and, if needed, the airbox out of the way.
• On the coil side, push the 4-wire connector in until it clicks and locks.
• The harnesses can be tucked under the intake runners: remember to reconnect any injector plugs you unclipped to do so.
• For extra security, add a zip tie around each 3-wire junction.
• If the engine runs rough on first start, switch it off and check every connection, including the ICM delete harness.

Fitment

• Audi A4 (B5) 1.8T 20V 150 hp: engine codes AEB and ATW
• VW Passat (B5, type 3B) 1.8T 20V 150 hp: engine codes AEB and ATW

This kit is only for 1.8T engines fitted with 3-wire coils and an ICM. Later 1.8T engines (Passat B5.5 3BG, Golf IV, Leon, TT, S3, etc.) come with 4-wire coils from the factory: they only need spacers to run TFSI coils. If in doubt, check the engine code on the block or the service book sticker, or contact us before ordering.