Opel Astra
Robustly designed Fiat diesel (GM licence) that achieves reliably high mileage with regular oil changes and motorway use. Critical weak points are the EGR valve, DPF with short-trip use and the dual-mass flywheel.
Solid 1.9 CDTI
88 kW from the 1.9 diesel – a good compromise between economy and performance in the Astra H.
Engine Weaknesses 4
The dual mass flywheel shows typical wear from around 80,000–150,000 km, especially in city driving. Replacement requires gearbox removal and is usually combined with clutch replacement.
Symptoms: Rattling or clattering at low revs below 1,200 rpm, shaking or juddering when pulling away, noise when engaging a gear that disappears when the clutch is pressed.
The Z19DT uses a timing belt with a replacement interval of 120,000–150,000 km or 10 years. Exceeding this risks belt failure with immediate engine damage from valve contact. Simultaneous water pump replacement is mandatory.
Symptoms: Possibly squealing or faint clattering from timing cover beforehand. When it breaks: engine stops immediately and will not restart.
The EGR valve clogs with soot from exhaust gases, especially with short-trip use. The valve sticks open or closed, triggering the engine warning light and power loss.
Symptoms: Engine warning light after cold start, rough idle, delayed throttle response, power loss at low revs, occasional stalling at standstill.
The diesel particulate filter only regenerates fully on longer motorway runs. Short-trip use prevents self-cleaning; frequent regeneration cycles shorten the oil change interval through fuel dilution.
Symptoms: Glow plug indicator flashes after failed regeneration, increased fuel consumption, strong smell when switching off, 'particulate filter full' warning in instrument cluster.
Vehicle Weaknesses 10
The M32 6-speed manual gearbox has undersized bearings in the gearbox casing. The bearings cannot cope with the factory tolerances long-term, resulting in whining in 5th/6th gear and gear lever vibration on load changes.
The AC condenser sits low in the front end and is heavily exposed to stone damage. Damaged fins lead to refrigerant loss.
The rear brake discs on the Astra H are prone to heavy surface corrosion, especially on vehicles that see little use. Discs often need replacing due to rust rather than wear.
On the Astra H 1.8 petrol engine the oil cooler gaskets fail, creating an oily, sludgy residue in the coolant expansion tank. If ignored, the cooling circuit becomes contaminated.
The electrohydraulic power steering on the Astra H fails intermittently or permanently. Cause: earth fault at the A-pillar to the CIM control unit, or faulty power steering pump. Steering becomes heavy.
Moisture penetrates through the chrome strip at the tailgate lower edge. The sealing is inadequate, leading to zinc bloom and rust under the paint.
The front axle anti-roll bar drop links wear comparatively quickly on the Astra H. Worn drop links cause dull knocking when cornering or over bumps.
Water enters the Astra H estate's boot through porous tailgate seals or leaking roof rail seam sealant. Moisture damage to the carpet and electronics is possible.
Recall (Opel): A contact fault in the steering column module (CIM) causes the horn to fail on Astra H and Zafira B (2004–2010). Affects hundreds of thousands of vehicles.
In the Astra H, plastic clips and trim around the interior mirror, instrument cluster, and centre console loosen. Creaking and rattling at certain RPM levels or road surfaces.
