2003 MG ZT problems

• 1.8 16V 117-136 hp (18K4F, 1995-2005)

  117–136 hp · 18K4F

  This is the version most cited in head gasket failures; it is worth buying if it already has the multi-layer (MLS) gasket with the liners measured, and Diariomotor considers its absence a good argument for negotiating the price.^[3][4][5]

  With caution

• 1.8 T turbo 150-160 hp (18K4T, 2002-2005)

  150–160 hp · 18K4T

  We have not found reliability data specific to the turbo; it inherits the K-Series' cooling circuit and gasket reputation, so it is worth demanding the coolant history.^[3][6]

  With caution

Faults that affect 2003 cars

• High severityFrequency: CommonCylinder head and blockHead gasket failureThe K-Series' big problem is the head gasket, which can fail even below 100,000 km because of a mix of gasket design, cooling and overheating. The usual repair uses the multi-layer steel (MLS) gasket that was developed for the Freelander.
• High severityFrequency: OccasionalCylinder head and blockSunken cylinder liners and warped head after overheatingAfter overheating, the K-Series liners can end up below the surface of the block and the aluminium head can be marked or warped; then no gasket seals properly and the liner height has to be measured and restored.
• Medium severityFrequency: OccasionalCoolingCoolant leaks: expansion tank cap, rear block rail and hosesThe K-Series circuit holds about 5.5 litres, so a slow leak empties the expansion tank and causes localised overheating. The points cited are the tank cap, the metal rail at the rear of the block (corrosion), the hoses and the coolant passages of the inlet manifold gasket.

• M47R 116-131 hp (Rover 75, MG ZT and Land Rover Freelander, 1998-2006)

  116–131 hp · M47R

  The M47R was designed with a different turbo and thermal management from the BMW-badged engine, so the faults documented in this entry for the D20/TU/TU2 versions cannot be directly extrapolated to it; we recommend general caution and a full mechanical inspection before buying.^[2][7]

  With caution

Faults that affect 2003 cars

• Critical severityFrequency: RareOtherOil leak from the brake vacuum pumpA BMW specialist workshop documents that the seals of the M47's vacuum pump, which generates the vacuum needed for brake assistance because a diesel does not produce it naturally, can wear and let oil through, which can end up stiffening the brake pedal.

• High severityFrequency: OccasionalBrakesCorroded brake pipesExcessively corroded brake pipes are the second most frequent MOT failure on the MG ZT in the UK: 9,201 cases out of 193,197 tests, or 4.8%.
• Medium severityFrequency: OccasionalBrakesHandbrake with insufficient holding powerThe handbrake is another weak point in the MG ZT's UK MOT results: 6,389 cases of insufficient effectiveness, 3,444 of lever with no reserve travel and 3,096 with no effort recorded.