Vauxhall Astra Astra H 1.7 CDTi 100bhp — Shock Absorber Oil Leak and Failure
Shock absorbers lose their damping efficiency over time, and eventually blow their seals, leaking hydraulic fluid.
Severity
ModerateDIY Difficulty
Moderate
Est. Cost
£200–£400
OBD Codes
None
Suspension
Typical layout and location for the Suspension assembly.
Symptoms
- Car bounces multiple times after hitting a bump
- Visibly wet, oily residue running down the outside of the shock absorber body
- Increased body roll in corners and longer braking distances
Root Cause
The internal rubber seals wear out from millions of oscillations. Grit on the damper shaft accelerates the wear, tearing the seal.
How To Fix
- Perform a 'bounce test' on each corner of the car — it should settle immediately after one rebound.
- Replace dampers in axle pairs.
- Consider replacing top mounts and bump stops simultaneously to save on future labour.
- Cost: £200-400 per pair.
Estimated Repair Costs
| Repair Option | Est. Cost (GBP) |
|---|---|
| DIY (parts only) | £80–£160 |
| Independent Garage | £200–£400 |
| Main Dealership | £320–£640 |
Other Faults on This Variant
EGR Valve Failure
ModerateThe Isuzu-sourced Z17DTH and Z17DTJ engines in the Astra H have a well-documented EGR valve failure. Carbon deposits cause the valve to stick, resulting in power loss and increased emissions.
DPF Blockage
ModerateDPF-equipped Astra H 1.7 CDTi models (post-2007) suffer from the same DPF blockage issues as most diesel Vauxhalls of this era. Urban use is the root cause.
Dual Mass Flywheel Failure
ModerateDMF wear on the Astra H 1.7 CDTi is a high-mileage inevitability. The flywheel's internal dampers lose effectiveness, causing vibration and judder that makes the car unpleasant to drive.
Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.