Mercedes-Benz M111.973 W202 W170 Kompressor 2.0L Complete Engine with Gearbox - Used Original Parts

Quick Answer

A complete M111.973 Kompressor engine with gearbox is the right fix when the original long block has terminal damage such as a spun bearing, a warped head or a failed supercharger, and the transmission is also tired. Replacing both as one matched, tested set avoids chasing faults across several separate parts. In Malaysia, a tested used original unit makes sense because these supercharged 4-cylinder Mercedes engines are no longer sold new as a whole, and a genuine used set keeps the car as the factory built it at a fraction of rebuild cost and downtime.

Diagnosis and Common Symptoms

The M111 Kompressor is a robust engine, but age, heat and skipped oil changes lead to a recognisable set of failures. A complete engine swap is usually justified when several of the following appear together:

• Low compression or internal damage: Hard starting, heavy blue smoke on startup, rising oil consumption, or coolant loss with white smoke point to worn rings, a failed head gasket or a cracked head. Stored codes often include P0300 to P0304 (random or cylinder-specific misfire).
• Timing chain wear: A rattle on cold start, or P0335 (crankshaft sensor) and P0340 (camshaft sensor) codes with poor idle, suggest a stretched chain and worn guides. If the engine has jumped time, valve damage often makes the whole engine uneconomical to repair.
• Supercharger and clutch faults: A whining or grinding noise under boost, or no boost with the check engine light on, can mean a failed supercharger bearing or magnetic clutch. If metal debris has entered the intake, the engine is at risk.
• Lean or rich mixture codes: P0171, P0172 and similar codes can come from a damaged wiring harness. The M111 harness insulation is known to harden and crack with heat and oil exposure, causing intermittent misfires and stalling.
• Low oil pressure: An oil warning light at hot idle, or knocking from the bottom end, usually indicates bearing wear caused by sludge or neglected servicing.
• Gearbox symptoms (automatic): Harsh or delayed engagement, flaring between gears, or limp mode locked in one gear often come from a worn valve body, a failed conductor plate or a torque converter shudder. A manual gearbox shows up as worn synchros, a noisy input bearing or a slipping clutch.

When the engine and gearbox both show wear, a complete matched set is the practical solution.

Introduction

This is a Genuine Used Mercedes-Benz M111.973 Kompressor engine supplied complete with its gearbox, taken from a running vehicle. The set is tested for running condition, with the engine inspected and the transmission checked for correct operation before we release it. Because it is a Genuine Used original assembly, it retains the factory fit, supercharger setup and tolerances that suit W202 and R170 applications. It is a dependable alternative to a costly rebuild, and a sensible choice for owners who want the original specification back on the road.

Product Details

• Brand: Mercedes-Benz

• Model Compatibility: W202 C-Class, W170 (R170 SLK) Kompressor models with the M111.973 engine

• Part Name: M111.973 Kompressor 2.0L Complete Engine with Gearbox

• Condition: Genuine Used (Tested Working)

• Notes: Confirm the engine code stamped on the block, and your transmission type (automatic or manual), before ordering. The ECU, immobilizer (EWS) module and key set must match the engine, so tell us if you need these supplied together. Replace the timing chain components, water pump, thermostat, belts, and all gaskets and seals during installation as good practice. Inspect the supercharger drive and intercooler piping for oil residue. Use fresh engine oil and the correct gearbox fluid for your transmission type.