IsItAGoodCar
Reliability Guide

Common Problems with the
2006 Toyota Avensis Mk2 (T25)

The 2006 model year brought the first significant wave of 2.2 D-4D and D-CAT diesel models, which would later become notorious for head gasket and block erosion issues. While not all units fail, the risk is real enough that due diligence is essential on any diesel T25. Petrol cars from this period remain straightforward and reliable.

What changed for 2006

  • •Introduction of the 2.2 D-4D and D-CAT diesel engines
  • •Revised instrument cluster and improved seat fabrics

Common MOT watch-outs

  • !Early signs of 2.2 diesel head gasket issues on neglected cars
  • !Corrosion beginning to appear on brake pipes and underbody
3
Known Issues
1
Serious
1
Moderate
1
Minor

All Known Issues

2.2 D-4D / D-CAT Head Gasket and Oil Consumption

SeriousEngine

The 2.2-litre AD-series diesel is the big T25 hazard, with head-gasket failure, block erosion and heavy oil use all well known on neglected or unlucky cars.

Est. Repair Cost: £1,500–£4,000
Warning Signs:

Coolant loss, White smoke, Frequent oil top-ups

What to Inspect:
  • Check the coolant bottle for signs of pressure or contamination
  • Ask directly about oil consumption
  • Look for invoices for major engine work
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Steering Column / Intermediate Shaft Knock

ModerateSteering

Some T25s develop a clonk or rattle through the steering column area on rough roads or when rocking the wheel at low speed.

Est. Repair Cost: £150–£700
Warning Signs:

Knock through steering wheel, Rattle over small bumps, Noise when turning at parking speed

What to Inspect:
  • Drive over broken surfaces at low speed
  • Gently rock the steering left-right when stationary
  • Ask if the intermediate shaft or column has been replaced
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Boot and Rear Lamp Water Ingress

MinorBodywork & Rust

Ageing seals around the rear lights and boot area can let water into the luggage compartment, leading to damp trim and minor electrical niggles.

Est. Repair Cost: £0–£200
Warning Signs:

Wet boot carpet, Condensation in rear lamps, Musty smell

What to Inspect:
  • Lift the boot floor and side trim
  • Check around the rear light seals for dampness
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Buying Tips for 2006 Toyota Avensis Mk2 (T25)

  • If buying a 2.2 diesel, insist on proof of regular oil and coolant changes and check for coolant loss
  • The 1.8 petrol is a much simpler proposition and should cost less to run long-term
20052007–2008
Check a 2006 Toyota Avensis Mk2 (T25) by Registration