IsItAGoodCar
Reliability Guide

Common Problems with the
2004 MG TF

We've identified 4 known issues that can affect the 2004 MG TF. 2 of these are serious faults that could be expensive to repair.

4
Known Issues
2
Serious
1
Moderate
1
Minor

All Known Issues

Head Gasket Failure

SeriousEngine

Like the ZR, the TF uses the K-Series engine. The mid-engine layout makes cooling even more critical.

Est. Repair Cost: £600–£900
Warning Signs:

Rising temperature needle, Oil/Coolant mixing, Steam from the engine bay

What to Inspect:
  • Look for a stainless steel under-car coolant pipe upgrade
  • Check the expansion tank for any signs of oil
Verified by IsItAGoodCar Research Team

Subframe and Sill Rust

SeriousBodywork & Rust

The front and rear subframes, sills, and rear wheel arches are highly prone to rust. Pre-2007 Chinese-built cars are generally better protected, but all TFs need careful inspection underneath.

Est. Repair Cost: £200–£800
Warning Signs:

Visible rust on subframes, Corrosion on sills, MOT failure on structural rust

What to Inspect:
  • Inspect the subframes, sills, and rear arches on a lift
  • Check the battery tray area for rot
Verified by IsItAGoodCar Research Team

Electrical Gremlins

ModerateElectrics & Electronics

Electric windows and central locking can play up. The roof wiring loom for heated rear screens often frays and breaks over time due to repeated folding.

Est. Repair Cost: £50–£200
Warning Signs:

Electric windows intermittent, Central locking not working, Heated rear screen failure

What to Inspect:
  • Test all electrical functions
  • Check the roof wiring loom for fraying
Verified by IsItAGoodCar Research Team

Interior Trim Wear

MinorInterior & Trim

Early TFs suffer from sagging seats, cracked dashboards, and worn gear knobs. Even later Chinese-built models are not immune to premature interior deterioration.

Est. Repair Cost: £50–£300
Warning Signs:

Sagging seat fabric, Cracked dashboard, Worn gear knob and switchgear

What to Inspect:
  • Inspect the seats, dashboard, and all touchpoints for wear
Verified by IsItAGoodCar Research Team

Buying Tips for 2004 MG TF

  • ✓Check the coolant level frequently; even a small leak can lead to HGF within minutes.
  • ✓Ensure the heater blows hot; if not, there is likely an air lock or HGF starting.
  • ✓Inspect the front subframe for rust, particularly around the mount points.
Check a 2004 MG TF by Registration