2.3 MZR DISI Turbo vs 1.33 Dual VVT-i: which engine is more reliable?

According to our risk index, the 1.33 Dual VVT-i carries less risk than the 2.3 MZR DISI Turbo: 54/100 versus 63/100 (both high risk). The 2.3 MZR DISI Turbo has 2 documented serious faults, the main one being «Timing chain stretch and VVT actuator failure on the 2.3 DISI Turbo»; the 1.33 Dual VVT-i has 1 documented serious fault, the main one being «Excessive oil consumption from piston wear».

Risk index

2.3 MZR DISI Turbo

High risk · 2 serious faults

Risk index

1.33 Dual VVT-i

High risk · 1 serious fault

Lower risk

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

Reviewed on 5 October 20269 sources How we work

Is the 2.3 MZR DISI Turbo reliable?

Mazda's 2.3 DISI Turbo (L3-VDT, 2005-2013) is powerful but demanding: the timing chain, the turbo and oil sludge are its weak points; only buy one with a good oil service history.^[1][2][3]

See the 3 of the 2.3 MZR DISI Turbo faults

Is the 1.33 Dual VVT-i reliable?

Yes, with caveats: the 1.33 Dual VVT-i (1NR-FE) is a simple naturally aspirated engine, with no turbo or DPF, and a timing chain. Units built before 2013 carry a factory defect in the pistons, acknowledged by Toyota in a technical bulletin, that sends oil consumption soaring and can end in engine replacement; Toyota corrected it from 2013. We found no specific pattern of water pump or sensor faults; keep an eye on the clutch, manual or with the MMT gearbox.^[4][5][6]

See the 3 of the 1.33 Dual VVT-i faults

Side-by-side comparison

Comparison of 2.3 MZR DISI Turbo and 1.33 Dual VVT-i
Item	2.3 MZR DISI Turbo	1.33 Dual VVT-i
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	2,261 cm³	1,329 cm³
Timing	Chain	Chain
Power	256–263 hp	97–105 hp
Production	2005–2013^[1][7]	since 2008^[4][8][9]
Reliability
Risk index (what is it?)	63High risk	54High risk
Documented faults	3	3
Of high or critical severity	2	1
Worst severity	Critical severity	Critical severity
Main faults	Critical severity: Timing chain stretch and VVT actuator failure on the 2.3 DISI Turbo High severity: Premature turbocharger wear from poor lubrication on the 2.3 DISI Turbo Medium severity: Oil consumption and sludge in the 2.3 DISI Turbo engine	Critical severity: Excessive oil consumption from piston wear Medium severity: Hard cold starting and fault code P1604 Medium severity: Premature clutch wear and MMT gearbox actuator faults
Most expensive documented repair	up to €2,200Premature turbocharger wear from poor lubrication on the 2.3 DISI TurboPublished figure^[2]	No reliable data
Which versions to buy
BuyRecommended versions	None	1.33 Dual VVT-i (1NR-FE, revised pistons and rings, from 2013)^[6]
With cautionVersions to be cautious about	2.3 MZR DISI Turbo 256-260 hp (L3-VDT, 2005-2009)^[1][2] 2.3 MZR DISI Turbo (L3-VDT, 2010-2013)^[1][2]	1.33 Dual VVT-i (1NR-FE, first series, 2008-2013)^[5]
AvoidVersions to avoid	None	None

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

2.3 MZR DISI Turbo

1.33 Dual VVT-i

See the 8 models with the 1.33 Dual VVT-i

Other comparisons

With the 2.3 MZR DISI Turbo

With the 1.33 Dual VVT-i

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Sources

Every fact on this page links to its source. If you find an error, let us know.

Mazda L engineWikipedia (inglés) · Other source · consulted 5 October 2026
Problemas Mazda CX-7Totalrenting · Other source · consulted 5 October 2026 · in Spanish
2009 Mazda CX-7 engine problemsCarComplaints · Owners' forum · consulted 5 October 2026
Toyota NR engineWikipedia · Other source · consulted 27 September 2026
Toyota 1.33 1NR-FE: Typische Probleme und SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Toyota Yaris III (XP13) – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published August 2023 · consulted 27 September 2026 · in German
Mazda CX-7Wikipedia (inglés) · Other source · consulted 5 October 2026
Toyota istWikipedia · Other source · consulted 27 September 2026
Toyota iQWikipedia · Other source · consulted 27 September 2026