Ford Mondeo Mk4 2.0 TDCi 140bhp — EGR Valve Failure
EGR failure on the Mondeo Mk4 TDCi causes power loss and rough running. Carbon build-up on the valve is the primary cause, accelerated by urban use.
Severity
ModerateDIY Difficulty
Moderate
Est. Cost
£200–£450
OBD Codes
P0400P0401EGR
Typical layout and location for the EGR assembly.
Symptoms
- EML and power loss
- Rough idle
- Increased fuel consumption
- P0400/P0401 codes
Root Cause
Carbon from recirculated exhaust gas coats the EGR valve and intake passages. The Mondeo's larger displacement means more soot volume through the EGR system.
How To Fix
- Remove and clean EGR valve
- Clean intake manifold
- Replace if worn beyond cleaning
- Cost: £200-450 fitted
Estimated Repair Costs
| Repair Option | Est. Cost (GBP) |
|---|---|
| DIY (parts only) | £80–£180 |
| Independent Garage | £200–£450 |
| Main Dealership | £320–£720 |
Other Faults on This Variant
Dual Mass Flywheel Failure
ModerateThe Mondeo Mk4 2.0 TDCi is a high-mileage rep car that almost inevitably needs its DMF replaced. It is one of the most consistent known faults across all Mondeo diesel ownership.
DPF Blockage
ModerateDPF blockage affects the Mondeo Mk4 TDCi when used as a local runabout rather than the long-distance motorway car it was designed for. High mileage examples with documented DPF service history are preferable.
Power Steering Rack Failure
ModerateThe Mondeo Mk4 uses an electric power steering rack that can develop faults, leaving the car with very heavy or completely absent power steering assistance.
Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.