IsItAGoodCar
Reliability Guide

Common Problems with the
2006 Mazda 5 (CR)

We've identified 2 known issues that can affect the 2006 Mazda 5 (CR). 1 of these are serious faults that could be expensive to repair.

2
Known Issues
1
Serious
1
Moderate
0
Minor

All Known Issues

2.0 CiTD Diesel DPF Blockage and Engine Oil Dilution

SeriousExhaust & Emissions

The 2.0-litre CiTD common-rail diesel engine fitted to the Mazda 5 CR utilises a closed-loop Diesel Particulate Filter (DPF) system that requires sustained exhaust temperatures to burn off trapped soot. On typical UK family school runs and urban errands, the car repeatedly attempts active regenerations by injecting extra post-combustion fuel. Unburnt diesel washes down cylinder walls into the oil sump, causing the engine oil level to rise progressively. Mazda added an 'X' mark above the full mark on the dipstick; if oil reaches this point, there is grave danger of diesel engine runaway or oil starvation. Concurrently, the DPF warning light flashes, requiring forced static regeneration and immediate oil replacement.

Est. Repair Cost: £350–£1,100
Warning Signs:

Flashing DPF warning light on the instrument cluster, Engine oil level visibly rising above the 'FULL' mark on the dipstick towards the 'X', Strong diesel smell from the engine bay and reduced engine pulling power in limp mode

What to Inspect:
  • Pull the oil dipstick on cold engine and ensure the oil level is strictly below the stamped 'X' mark
  • Review service history to confirm low-SAPS C1 engine oil has been used at every service
Verified by IsItAGoodCar Research TeamUpdated

Rear Suspension Trailing Arm Bush Wear and Inner Tyre Scrubbing

ModerateSuspension & Chassis

The Mazda 5 CR features a multi-link rear suspension setup that delivers sharp handling but places immense stress on the rear trailing arm compliance bushes. When carrying family passengers and luggage over UK potholes, the rubber bushes perish, deform, and delaminate. This introduces uncontrolled negative camber and dynamic toe-out on the rear wheels. As a result, the inner edges of both rear tyres scrub down to the cords prematurely, often in as little as 8,000 miles, while the outer tread remains deceptively healthy. Drivers experience a wandering rear axle over motorway expansion joints and road noise, and the hidden cord wear results in immediate UK MOT failure.

Est. Repair Cost: £250–£550
Warning Signs:

Severe wear on the inner shoulder of rear tyres down to the canvas cords, Rumbling road roar from the rear that mimics a worn wheel bearing, Rear axle feels loose or steps out when driving over wet drain covers or ruts

What to Inspect:
  • Turn the steering wheel and reach behind the rear wheels to feel the inner tyre tread shoulder across its entire circumference
  • Inspect the rear trailing arm large rubber bushes for tears, cracks, or oil damping leakage
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2006 Mazda 5 (CR)

  • Inspect the inner edges of both rear tyres with your hand; rear suspension trailing arm bush wear causes severe inner edge scrubbing that is easily missed.
  • Open and close both rear sliding side doors from inside and outside to confirm the rollers glide smoothly without sticking or catching.
  • On 2.0 CiTD diesel models, check the oil dipstick; oil level above the 'X' mark indicates excessive fuel dilution from interrupted DPF regenerations.
  • Listen for whining or buzzing from the electro-hydraulic power steering pump and confirm steering assist does not cut out when parking.
  • Test the folding mechanism of the middle-row Karakuri centre seat to verify the fold-out cushion and storage bin mechanisms operate smoothly.
20052007
Check a 2006 Mazda 5 (CR) by Registration