Nissan Navara: YD25DDTi Rear Timing Chain Tensioner Catastrophic Failure

The YD25DDTi 2.5-litre diesel has a rear-mounted secondary timing chain tensioner that is entirely oil-pressure dependent. If oil pressure drops – through low oil level, degraded oil, or a faulty pump – the tensioner collapses, the chain slackens, and the engine suffers catastrophic internal damage including bent valves and broken pistons. This failure mode was the subject of an Australian ACCC recall action in 2012. It remains the most expensive and common serious failure on the D40 Navara diesel.

• Loud rattle from the rear of the engine on cold start
• Check engine light with camshaft timing fault codes (P0016, P0340)
• Sudden engine knock followed by loss of power
• Engine will not restart after stalling
• Metal debris visible in oil on drain or in oil filter element

1. 1

   Check oil level and condition before anything else – this failure is strongly correlated with low or degraded oil.

2. 2

   Ask for a documented oil service history; any gap beyond 10,000 km is a serious risk indicator.

3. 3

   Cold-start the engine and listen for rattle from the rear of the engine bay.

4. 4

   Request pre-purchase inspection by a Nissan-familiar diesel mechanic to check tensioner oil feed passages.

Parts involved: Timing chain.

$5,000 to $14,000 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 rear timing chain tensioner been inspected or replaced?”
• “What is the documented oil change interval and oil specification used?”
• “Has the oil pressure warning light ever illuminated?”
• “Is there evidence of Australian recall compliance for the YD25 tensioner campaign?”

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.