Toyota 2.0 D-4
Direct injection engine with D-4 technology. Known for elevated oil consumption due to piston ring coking. Regular oil level checks are important.
Solid everyday engine
The 2.0 D-4 offers adequate power for the Avensis. Direct injection provides good mid-range pull, but also well-known oil consumption issues.
Engine Weaknesses 7
At higher mileages the oil scraper rings become coked up through direct injection deposits. Affected engines consume 0.5–1.5 litres per 1,000 km. Toyota acknowledged the problem and introduced revised piston rings in 2008.
Symptoms: Clearly dropping oil level between service intervals, blue smoke from the exhaust on cold start and under partial load, oil smell in the cabin
On early 1AZ-FSE engines (up to 2006), the head bolts were designed too short, reducing the sealing effect of the head gasket. Toyota lengthened the bolts from 2006 onwards. Affected vehicles lose coolant with no visible external leak.
Symptoms: Coolant loss with no visible leak points, bubbling in expansion tank, pressure build-up in the cooling system, overheating tendency, possible oil-coolant mix
The D-4 direct injection system does not wash the intake valves with fuel, so oil vapours from the crankcase ventilation accumulate and coke freely. From around 80,000 km deposits build up and noticeably reduce power and idle quality.
Symptoms: Rough idle, power loss at low revs, slight hesitation when pulling away from idle, increased fuel consumption
The mechanical high-pressure pump on the D-4 direct injection system can fail through wear or fuel contamination. The fuel rail pressure sensor tends to develop an internal short circuit, causing misfires and hard starting.
Symptoms: Hard starting, rough idle, fault codes P0171/P0174 (mixture too lean), power loss at higher revs, black soot at the exhaust
In Avensis vehicles built between 2000 and 2005, early lead-free solder was used, which can develop micro-cracks in the ECU solder joints. Fault codes return within a short time after being cleared.
Symptoms: Recurring fault codes with no definitive defect, intermittent misfires, start problems when temperature changes, sensor signal anomalies when cold
Toyota recalled certain 1AZ-FSE engines in 2008 due to faulty spark plugs that contributed to elevated oil consumption. The thermal load capacity of the spark plug electrode was inadequately designed.
Symptoms: Elevated oil consumption, occasional misfires, slight hesitation under load, blue oil-burning haze on acceleration
The timing chain housing gasket on the 1AZ-FSE ages and hardens over time. At higher mileages oil drops appear in the engine bay, which can lead to oil starvation and consequential damage if ignored.
Symptoms: Oil drops under the car after parking, oil smell from the engine bay, visible oil film traces on the timing chain housing, dropping oil level
Vehicle Weaknesses 10
Underbody protection on the T250 is only moderately applied. Rust pockets form at welded joints, subframes and sills.
The evaporator behind the dashboard corrodes and loses refrigerant. Repair is labour-intensive due to the need to remove the dashboard.
The input shaft bearing in the manual gearbox wears and causes noise at idle.
Driveshaft gaiters split and steering gear covers develop leaks. Track rod ends can come loose if incorrectly fitted.
Dashboard illumination fails, radio display shows errors or goes blank. Tail lights can become unsealed.
The rear brake discs warp from approximately 60,000 km, especially on estate variants with frequent loading.
Play in the steering column universal joint produces a knocking noise during steering inputs, particularly on uneven surfaces.
The hydraulic power steering on the T250 develops squealing or groaning noises with age, traceable to the seal ring around the steering spindle or worn steering components. Temporarily eased with lubricant.
The T250's boot lid lock has no manual emergency release. If the electric lock or remote control fails, the boot stays locked. The electric lock system is susceptible to control unit faults.
The driver's seat heating on the T250 can fail at higher mileage while the indicator light continues to show it as active. Defective heating mats or broken wiring in the movable seat are the usual cause.