Audi A4 B5 / VW Passat B5 1.8T AEB ATW - 2.0 TFSI Coil Conversion and ICM Delete Kit Dynaparts

The cure for temperamental ignition on early 1.8T engines

On Audi A4 B5 and VW Passat B5 models with the 150 hp 1.8T, ignition relies on passive 3-wire coil packs driven by an ignition control module (ICM) mounted on the airbox. It is a well-known weak point: rough idle, misfires when hot, and a check engine light with no obvious cause. Instead of replacing an ICM or expensive factory coils yet again, this Dynaparts kit fixes the problem for good.

The principle is simple: 2.0 TFSI / TSI coils have a built-in igniter and take the ECU signal directly. The ICM is no longer needed and is removed.

What's in the kit

• 4 conversion harnesses connecting the original 3-wire plug to the 4-wire coils
• 1 ICM delete harness, which plugs in place of the factory module

Important: coils and spacers are not included. You will need:

• 4 × 2.0 TFSI / TSI coil packs (for example the Dynaparts Plasma coil, ref. DP-ENG-COIL-VAG-01)
• 4 coil spacers, required to seat the TFSI coils at the correct height on the 1.8T valve cover (Dynaparts ref. DP-ENG-IGNITION-VAG-02)

Why switch to 2.0 TFSI coils

• Modern, widely available parts, much cheaper than the factory coils
• More consistent spark under load and a steadier idle
• Wider spark plug gap possible, useful on a tuned engine
• One less fragile component under the bonnet

Installation

The harnesses are custom-made and plug straight in: no cutting, no soldering, the factory loom stays intact and the conversion is reversible. A few tips:

• Move the coolant expansion tank, the MAF and, if needed, the airbox to reach the front coils.
• On the coil side, push the connector in until it clicks and locks.
• If you tuck the harnesses under the intake runners, remember to reconnect the injector plugs.
• A zip tie on each 3-wire junction adds extra security.
• If the engine runs rough on start-up, switch it off and check every connection.

Fitment

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

This kit is only for 1.8T engines with 3-wire coils and an ICM. Later 1.8T engines (Passat B5.5 3BG, Golf IV, Leon, TT, S3, etc.) already have 4-wire coils: simple spacers are enough to fit TFSI coils. Check the engine code on the block or the timing belt cover label before ordering.