Opel Astra
Solid naturally aspirated engine with good refinement, but known weaknesses in the timing chain drive. Examples before engine number 11065400 (March 2002) have an inadequately lubricated primary chain. Piston rings with insufficient tangential tension lead to elevated oil consumption.
Naturally aspirated engine with muscle
108 kW from 2.2 litres without turbo lag – linear surge, gritty sound, classic driving fun.
Engine Weaknesses 7
The guide rail retaining bolt in the cylinder head can come loose or break, causing chain slap. In the worst case, a cylinder head replacement is needed. Engines before no. 11065400 (up to March 2002) are particularly affected.
Symptoms: Rattling or clattering noises in the timing chain area, especially on cold start; in advanced stages misfires and engine warning light
The secondary chain for the balance shafts can fail together with the chain tensioner. A break leads to severe engine vibrations and secondary damage. A complete chain replacement always includes both chain sets.
Symptoms: Strong irregular vibrations, metallic clattering from engine bay; sudden severe power loss when chain breaks
Engines in the serial number range 11300883–11378500 were produced with piston rings whose tangential preload was outside specification. The rings lose radial force prematurely; oil consumption up to 0.5–1 L/1,000 km.
Symptoms: Blue smoke from exhaust at higher revs; strong airflow from the oil dipstick with the engine running indicates piston rings
The ignition control module on the Z22SE is sensitive to heat and can fail when it gets hot. The engine then will not start or runs rough. Replacing the module resolves the problem permanently.
Symptoms: Engine will not start or starts with a delay, intermittent misfires at operating temperature
The plastic coolant expansion tank on the Z22SE tends to crack at higher mileages. Excessive coolant loss can lead to overheating. Regular visual inspection recommended.
Symptoms: Dropping coolant level, visible cracks or moisture on reservoir, temperature rise
The thermostat tends to stick or open with a delay at higher mileages, causing fluctuating operating temperatures. On the motorway in particular, temperature swings of 10–15 °C are visible.
Symptoms: Temperature gauge fluctuating between 80 °C and 100 °C; engine does not reach normal operating temperature at high speed
The Z22SE has no conventional camshaft sensor; its function is taken over by the ignition module. Faulty connectors or a worn ignition module trigger fault code P0340. Checking the cable connections is often sufficient.
Symptoms: Rough idle, misfires, engine warning light with fault code P0340; engine hard to start or briefly will not start
Vehicle Weaknesses 14
Notorious weak point: the rear wheel arches rust from the inside out because the full galvanising was applied before welding. There was a recall.
The rear axle spring seats and the mounting points beside the rear axle mounting are affected by rust across all models. Severe rust can lead to MOT failure.
The brake lines run partially in contact with the bodywork and corrode from the outside, leading to MOT failure or brake failure.
The structural sills are a known rust attack point. Rust-through requires extensive repair with replacement sill sections and is a safety concern.
Tie rod ends and steering linkage wear above average, causing play in the steering and MOT failures.
The firm suspension transmits vibrations to the headlights and loosens the bulb contacts. Soldering a resistor wire to the socket permanently fixes the problem. Typical for the 1998–2002 build years.
The EGR valve on the Astra G sticks open due to soot deposits, causing false air ingestion at low RPM and making the engine stall.
The exhaust systems on the Astra G corrode prematurely, especially at the joints and the rear silencer. Vehicles without regular cavity protection are almost universally affected.
The electrohydraulic power steering on the Astra G can fail through pump failure or leaks, making steering — especially at low speeds — very heavy.
On the Astra G front axle, the control arms corrode and the control arm rubber bushings crack. Typical from 120,000 km: imprecise steering, clunking over bumps, MOT failures for worn bushings.
The cable in the electric window regulator snaps frequently. The system is designed as a complete unit, making individual repairs difficult.
The heater blower resistor burns out. The fan then only works on the highest speed setting. Common from 80,000–100,000 km; inexpensive part but awkward to access behind the glovebox.
The foam seal under the scuttle panel detaches. Rainwater runs directly into the blower motor and exits in the passenger footwell. Very widespread on older examples.
In the Astra G, plastic clips and foam dampers in the dashboard detach with age. Creaking and rattling, especially in cold temperatures and on rough road surfaces.
