IsItAGoodCar
Reliability Guide

Common Problems with the
2003 Toyota Avensis Mk1 (T22)

The final year of the T22 before the T25 arrived. Late cars are the best of the breed if they have been well-maintained, but corrosion is now the deciding factor on most survivors. Parts remain available through Toyota and aftermarket suppliers, and simple mechanicals make DIY servicing straightforward.

What changed for 2003

  • •Final production year before the T25 redesign
  • •Late models may include running improvements to corrosion protection

Common MOT watch-outs

  • !Advanced structural corrosion requiring welding
  • !Alternator failure on high-mileage examples
4
Known Issues
1
Serious
2
Moderate
1
Minor

All Known Issues

Structural Corrosion

SeriousBodywork & Rust

Ageing T22s commonly rust around the sills, rear arches, rear floor and brake-pipe areas, turning a cheap dependable saloon into a welding project.

Est. Repair Cost: £300–£1,500
Warning Signs:

Bubbling arches, Crusty sills, MOT advisories for corrosion or brake pipes

What to Inspect:
  • Inspect the sills and rear arches closely
  • Look underneath for flaky metal around the rear floor
  • Check the brake lines for heavy corrosion
Verified by IsItAGoodCar Research Team

Starter Motor Failure

ModerateElectrics & Electronics

The starter motor can fail on higher-mileage T22s, especially if the car is used for short trips.

Est. Repair Cost: £200–£400
Warning Signs:

Slow cranking, Clicking noise when turning key, Car fails to start

What to Inspect:
  • Listen for slow cranking or clicking on startup
Verified by IsItAGoodCar Research Team

Alternator Failure

ModerateElectrics & Electronics

The alternator can fail on higher-mileage cars, leading to battery drain and electrical issues.

Est. Repair Cost: £200–£400
Warning Signs:

Battery warning light, Dimming headlights, Electrical accessories failing

What to Inspect:
  • Check battery voltage with engine running (should be ~14V)
  • Look for battery warning light
Verified by IsItAGoodCar Research Team

Air Conditioning Compressor Failure

MinorCooling System

The A/C compressor can seize on older cars, particularly if the system has not been used regularly.

Est. Repair Cost: £300–£600
Warning Signs:

A/C not blowing cold, A/C light flashing, Noise from compressor area

What to Inspect:
  • Test the A/C at full blast
  • Listen for compressor clutch engagement
Verified by IsItAGoodCar Research Team

Buying Tips for 2003 Toyota Avensis Mk1 (T22)

  • Only buy a late T22 if the sills, arches and subframe are solid
  • Budget for undersealing and rust treatment regardless of apparent condition
2001–2002
Check a 2003 Toyota Avensis Mk1 (T22) by Registration