H4D: Cleaning throttle body without dismantling

crwdns2936071:01crwdne2936071:0 — Remove the air filter housing

Using a screwdriver, loosen the two Torx T25 screws on the air filter cover.

crwdns2936071:02crwdne2936071:0 — Clear the air duct

Disconnect the oil vapour breather.

crwdns2936071:03crwdne2936071:0 — Cleaning the throttle valve

Spray brake or contact cleaner on the throttle and use a soaked paper towel to clean it until the body and edges are clean.

crwdns2936071:04crwdne2936071:0 — Refitting the airbox

Replace the pipe as far as it will go.

crwdns2936071:05crwdne2936071:0 — First restart

The throttle position sensor is set when the ignition is switched off (you will hear a click/click sequence from the throttle). Using an OBD tool is not necessary. The only function available fully resets all parameters, and requires the following step in any case.