CriticalAffected: 2013-201870,000–120,000 miles

Vauxhall Astra Astra J 1.6 CDTi 110bhp — Timing Chain Rattle (Rear Mounted)

The 'Whisper Diesel' 1.6 CDTi has its timing chain mounted at the rear of the engine (gearbox side). It stretches and rattles terribly.

Severity

Critical

DIY Difficulty

Professional Only

Est. Cost

£1200–£1800

OBD Codes

None

Component Diagram

Timing Chain

Typical layout and location for the Timing Chain assembly.

Reference Illustration

Symptoms

Loud metallic rattle on cold start lasting 3-5 seconds
Continuous rattle at idle when engine is hot
EML for camshaft timing

Root Cause

The hydraulic chain tensioner gasket design is flawed, allowing oil pressure to bleed away overnight. The chain stretches due to running without tension on startup.

How To Fix

Engine MUST be removed (or gearbox removed) to access the chain. Vauxhall released a revised tensioner gasket. Huge labour cost. Cost: £1,200-£1,800

Estimated Repair Costs

Repair Option	Est. Cost (GBP)
DIY (parts only)	£480–£720
Independent Garage	£1200–£1800
Main Dealership	£1920–£2880

Other Faults on This Variant

Timing Chain Rattle and Tensioner Failure

Critical

2012-201560,000–120,000 miles£800–£1500

The 1.6 CDTi A16DTH/DTJ engine is notorious for timing chain noise and failure, often from as low as 60,000 miles. This is the most serious known fault on the Astra J diesel.

Clutch Pedal Sticking Down

Severe

2009-201550,000–100,000 miles£150–£700

The clutch pedal fails to return to the top of its travel, often getting stuck halfway or hitting the floor completely.

DPF Blockage and Regeneration System Failure

Severe

2012-201540,000–90,000 miles£200–£1000

DPF blockage is extremely common on the Astra J 1.6 CDTi. The engine's tendency to get stuck in failed regen cycles results in diesel contaminating the engine oil — a serious secondary issue.

Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.