MZR-CD vs 2.0 BlueHDi: which engine is more reliable?

According to our risk index, the 2.0 BlueHDi carries less risk than the MZR-CD: 45/100 (moderate risk) versus 64/100 (high risk). The MZR-CD has 3 documented serious faults, the main one being «Timing chain stretch on the 2.2 MZR-CD»; the 2.0 BlueHDi has 2 documented serious faults, the main one being «DPF clogging on short journeys».

Risk index

MZR-CD

High risk · 3 serious faults

Risk index

2.0 BlueHDi

Moderate risk · 2 serious faults

Lower risk

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

Reviewed on 27 September 202620 sources How we work

Is the MZR-CD reliable?

The MZR-CD is Mazda's most widespread diesel between 2002 and 2013, fitted to the Mazda3, Mazda6, Mazda5 and CX-7. It is sensitive to short journeys: the injector seals and incomplete DPF regenerations can dilute the oil, and the EGR and intake build up carbon. The 2.2-litre redesign (from 2008), with a timing chain instead of a belt, adds the risk of that chain stretching and damaging the engine.^[1][2][3][4]

See the 4 of the MZR-CD faults

Is the 2.0 BlueHDi reliable?

The 2.0 BlueHDi is mechanically one of the sturdiest PSA/Stellantis diesels: in the samples available for its 150 to 180 hp versions, the turbo, DPF, EGR and injectors fail noticeably less often than on earlier generations of the same engine from before 2013. Its documented weak point is the AdBlue tank, a fault so widespread that Stellantis compensates affected owners without a definitive fix.^[5][6][7][8]

See the 4 of the 2.0 BlueHDi faults

Side-by-side comparison

Comparison of MZR-CD and 2.0 BlueHDi
Item	MZR-CD	2.0 BlueHDi
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	—	1,997 cm³
Timing	Timing belt (dry)	Timing belt (dry)
Power	105–185 hp	150–180 hp
Production	2002–2013^{[9][10][11][12][13]}	2013–2021^[14][15][16]
Reliability
Risk index (what is it?)	64High risk	45Moderate risk
Documented faults	4	4
Of high or critical severity	3	2
Worst severity	Critical severity	High severity
Main faults	Critical severity: Timing chain stretch on the 2.2 MZR-CD High severity: Oil dilution from leaking injector seals and DPF regenerations High severity: Turbocharger wear or failure	Medium severity: AdBlue (SCR) tank and pump failure High severity: DPF clogging on short journeys High severity: Injector and high-pressure pump wear
Most expensive documented repair	No reliable data	up to €1,500AdBlue (SCR) tank and pump failurePublished figure^[7][8]
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	2.0 MZR-CD 121-143 (RF, 2002-2005, no DPF)^[1][3][17] 2.0 MZR-CD 105-143 (RF, 2005-2010, with DPF)^{[1][3][17][18]} 2.2 MZR-CD 125-185 (R2, 2008-2013)^{[2][4][19][20]}	2.0 BlueHDi 150/163 (DW10FC/DW10FD, 2013-2020)^[5][7][8] 2.0 BlueHDi 177/180 (DW10FC/DW10FD, 2013-2021)^[5][6]
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

MZR-CD

2.0 BlueHDi

See the 13 models with the 2.0 BlueHDi

Other comparisons

With the MZR-CD

With the 2.0 BlueHDi

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Sources

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

Fiabilité Mazda 6 (2002-2008)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité Mazda 6 (2008-2013)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Mazda 6 I: Bekannte Probleme und Schwachstellengebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Mazda 6 II: Bekannte Probleme und Schwachstellengebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Fiabilité du 2.0 HDIFiches-Auto · Motoring press · consulted 27 September 2026 · in French
Fiabilité Opel Grandland X (2017-2024), pannes et témoignagesFiches-Auto · Motoring press · consulted 27 September 2026 · in French
AdBlue : problèmes en pagailleFiches-Auto · Motoring press · consulted 27 September 2026 · in French
Stellantis amplía las compensaciones por los problemas técnicos de sus depósitos AdBlueMinisterio de Derechos Sociales, Consumo y Agenda 2030 · Official body · consulted 27 September 2026 · in Spanish
Mazda diesel enginesWikipedia (inglés) · Other source · consulted 27 September 2026
Mazda6Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mazda3Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mazda5Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mazda CX-7Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
PSA EW/DW engineWikipedia (inglés) · Other source · consulted 27 September 2026
Peugeot 308Wikipedia (inglés) · Other source · consulted 27 September 2026
Peugeot 308 5p GT 2.0 BlueHDi 180 S&S EAT8 (2017-2019) | Precio y ficha técnicakm77 · Motoring press · consulted 27 September 2026 · in Spanish
Fiabilité Mazda 3 (2003-2009)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Japanische Zuverlässigkeit? Ärger mit den Dieseln von Mazda und Toyotagebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Fiabilité Mazda 3 (2009-2013)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Mazda 3 II (2009-2013): Typische Probleme & Schwachstellengebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German