Mercedes-Benz E-Class: M274 2.0T HPFP cam follower wear causing fuel pressure loss

The M274 2.0-litre turbocharged four-cylinder petrol engine uses a mechanical high-pressure fuel pump driven by a dedicated lobe on the intake camshaft via a roller follower tappet. The follower wears rapidly, often within 60,000 km, due to marginal lubrication at the contact surface. Worn followers cause fuel rail pressure drop, misfires, and hard hot-starting. If the follower collapses entirely, the cam lobe contacts bare metal and destroys the camshaft, requiring complete head disassembly. Early detection through scheduled follower inspection every 40,000 km prevents the far more expensive camshaft repair. Oil change interval compliance is critical — extended intervals accelerate wear significantly.

• Hard starting particularly when engine is at operating temperature
• Misfires or stumbling under load especially at higher engine speeds
• Low fuel pressure fault codes P0087 or P0191 on diagnostic scan
• Engine hesitation or flat spot during acceleration
• In advanced cases, metallic debris visible in engine oil

1. 1

   Request written evidence of HPFP cam follower inspection or replacement in the service records.

2. 2

   Access the follower via the HPFP mounting point and inspect its contact face for pitting, flat spots, or excessive wear depth.

3. 3

   Check for any fuel pressure or misfire fault codes stored on the OBD2 system.

4. 4

   Confirm oil changes performed at maximum 10,000 km intervals with correct low-SAPS specification oil.

Parts involved: High-pressure fuel pump.

$800 to $5,500 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the HPFP cam follower been inspected or replaced and at what mileage?”
• “Any misfires, hard hot-starting, or low fuel pressure warning codes ever recorded?”
• “Oil changes completed every 10,000 km or less with the correct Mercedes-approved oil?”
• “Has the high-pressure fuel pump itself ever been replaced?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.