IsItAGoodCar
Reliability Guide

Common Problems with the
2004 MG ZS (Classic)

The 2004 facelift gave the ZS clear one-piece headlights, new bumpers and a flush tailgate with the number plate moved to the bumper, while the 180 gained an XPower SV-style bodykit.

What changed for 2004

  • •One-piece clear headlights and redesigned front and rear bumpers
  • •Flush tailgate and boot lid with the number plate relocated to the bumper
  • •ZS 180 bodykit with wheel arch extensions and 17-inch eleven-spoke alloys

Common MOT watch-outs

  • !Brake pipe corrosion along the rear axle
  • !Emissions failure from a tired catalyst on K-Series cars
  • !Split steering rack gaiters and play in the track rod ends
4
Known Issues
1
Serious
2
Moderate
1
Minor

All Known Issues

K-Series Head Gasket Failure (1.6/1.8 Petrol)

SeriousEngine

The 1.6 and 1.8 K-Series petrol engines are prone to head gasket failure, especially if the cooling system has been neglected. Blown head gaskets are a well-known fault on this platform.

Est. Repair Cost: £500–£800
Warning Signs:

Overheating, Oil/coolant mixing ("mayonnaise" under oil cap), Loss of heater performance

What to Inspect:
  • Check the oil filler cap and expansion tank for contamination
  • Verify the radiator and hoses are in good condition
Verified by IsItAGoodCar Research Team

V6 VIS Motor Failure

ModerateEngine

The Variable Intake System (VIS) motors on the 2.5 V6 fail, leaving the butterfly valves stuck in one position.

Est. Repair Cost: £150–£300
Warning Signs:

Loss of power above 3,000rpm, Rattling from the plastic intake plenum, Flat spots in acceleration

What to Inspect:
  • Listen for a "bag of marbles" sound from the manifold
  • A simple "VIS tester" can be used to check motor function
Verified by IsItAGoodCar Research Team

Front Suspension Bush Wear

ModerateSuspension & Chassis

The front suspension bushes wear prematurely, leading to vague steering, knocking noises over bumps, and uneven tyre wear. This is a common MOT failure point.

Est. Repair Cost: £100–£250
Warning Signs:

Knocking from the front end, Vague or imprecise steering, Uneven front tyre wear

What to Inspect:
  • Inspect the front lower arm bushes for splits or movement
  • Check for MOT advisories on suspension components
Verified by IsItAGoodCar Research Team

Boot Strut Failure

MinorBodywork & Rust

The gas struts supporting the boot lid weaken over time, especially on hatchbacks with large rear spoilers. The boot may not stay open on its own.

Est. Repair Cost: £30–£80
Warning Signs:

Boot lid falls shut, Difficulty holding the boot open, Struts visibly leaking oil

What to Inspect:
  • Open the boot and check if it stays up unaided
Verified by IsItAGoodCar Research Team

Buying Tips for 2004 MG ZS (Classic)

  • Check the bodykit and bumper alignment for signs of accident repair
  • Verify the climate control and heated seats work on facelift cars
  • Inspect the rear arches behind the bodykit for trapped mud and rust
2002–20032005
Check a 2004 MG ZS (Classic) by Registration