BMW X1: B47 Timing Chain Tensioner Wear & Cold Rattle

The B47 2.0D hydraulic timing chain tensioner loses oil pressure when the engine sits overnight, allowing chain slack on cold start. A metallic rattling noise from the front of the engine is audible for 5-20 seconds until oil pressure rebuilds. Prolonged operation with a fatigued tensioner risks chain skip or jump, leading to valve-to-piston contact and catastrophic internal engine damage. The B47 shares design lineage with the N47 which suffered severe timing chain failures in earlier X1 variants, and while improved the tensioner remains a wear item requiring monitoring.

• Metallic rattling from engine front on cold start clearing within seconds
• Check engine light with fault codes P0016 or P0017 (cam/crank correlation)
• Increased engine oil consumption
• Rough or erratic cold idle before oil pressure stabilises

1. 1

   Cold-start the engine and listen for a metallic rattle from the timing cover at the front of the engine.

2. 2

   Note duration before it clears.

3. 3

   Check oil level and review stored fault codes for camshaft-to-crankshaft correlation errors.

4. 4

   Ask for documented oil change intervals as infrequent oil changes accelerate tensioner wear.

Parts involved: Timing chain.

$2,800 to $5,800 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 timing chain tensioner or timing chain ever been replaced?”
• “Do you notice any rattling noise on cold start?”
• “Can you provide full service history showing oil change intervals?”

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.