2.0 CDI (OM640) vs 2.2 HDi: which engine is more reliable?

According to our risk index, the 2.0 CDI (OM640) carries less risk than the 2.2 HDi: 36/100 versus 48/100 (both moderate risk). The 2.0 CDI (OM640) has 2 documented serious faults, the main one being «Costly failure of the Autotronic (CVT) automatic gearbox»; the 2.2 HDi has 3 documented serious faults, the main one being «DPF clogging with additive, especially on the 128-138 hp version».

Risk index

2.0 CDI (OM640)

Moderate risk · 2 serious faults

Lower risk

Risk index

2.2 HDi

Moderate risk · 3 serious faults

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

Reviewed on 27 September 202616 sources How we work

Is the 2.0 CDI (OM640) reliable?

The OM640 is the 2.0 CDI four-cylinder diesel that Mercedes-Benz fitted between 2004 and 2012 to the A-Class (W169) and B-Class (W245), with outputs from 82 to 140 hp (160/180/200 CDI). Its mechanical base is considered reliable, with the EGR valve and the injectors being typical weak points of diesels of that era; the problem owners cite most, however, is the Autotronic (CVT) automatic gearbox, optional on the 180 CDI and 200 CDI.^[1][2][3][4]

See the 4 of the 2.0 CDI (OM640) faults

Is the 2.2 HDi reliable?

This is a diesel derived from the 2.0 HDi that PSA and Ford shared in large saloons and MPVs (407, 607, 807, C5, C6, C8) and that Land Rover and Ford used under their own names (TDCi, TD4, SD4) in the Mondeo IV, the Freelander 2 and the first Evoque. According to fiches-auto it does not suffer chronically from the turbo or dual-mass flywheel problems of smaller HDi engines, but the 128-138 hp version does have a recurring problem of DPF clogging.^[5][6][7][8]

See the 4 of the 2.2 HDi faults

Side-by-side comparison

Comparison of 2.0 CDI (OM640) and 2.2 HDi
Item	2.0 CDI (OM640)	2.2 HDi
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	1,991 cm³	2,179 cm³
Timing	Chain	Timing belt (dry)
Power	82–140 hp	128–204 hp
Production	2004–2012^{[1][9][10][11]}	2000–2015^{[5][7][12][13][14]}
Reliability
Risk index (what is it?)	36Moderate risk	48Moderate risk
Documented faults	4	4
Of high or critical severity	2	3
Worst severity	Critical severity	High severity
Main faults	Critical severity: Costly failure of the Autotronic (CVT) automatic gearbox High severity: Premature turbocharger wear or failure Medium severity: EGR valve clogged with soot	High severity: DPF clogging with additive, especially on the 128-138 hp version High severity: Turbo faults, somewhat more frequent on the sequential twin-turbo versions High severity: Piezo injector wear and failure
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	2.2 HDi 150-156 (single variable-geometry turbo, 2006-2012)^[15][16]
With cautionVersions to be cautious about	160 CDI (60 kW/82 hp, A-Class only)^[2][10] 180 CDI (80 kW/109 hp)^[2][3] 200 CDI (103 kW/140 hp)^[2][4]	2.2 HDi 128-138 (DW12 TED4, single turbo, 2000-2006)^[8] 2.2 HDi 170-175 twin-turbo (DW12 BTED4, 2005-2010)^[8][13] 2.2 HDi 190-204 twin-turbo (DW12 C, 2010-2015)^[13]
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

2.0 CDI (OM640)

2.2 HDi

See the 12 models with the 2.2 HDi

Other comparisons

With the 2.0 CDI (OM640)

With the 2.2 HDi

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Sources

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

Mercedes-Benz OM 640Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mercedes A-Klasse (W169) – Typische Probleme & SchwachstellenGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
Fiabilité des 180d / 180 CDI MercedesFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité 200 CDI MercedesFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
PSA EW/DW engineWikipedia (inglés) · Other source · consulted 27 September 2026
Ford MondeoWikipedia (francés) · Other source · consulted 27 September 2026 · in French
Land Rover FreelanderWikipedia (francés) · Other source · consulted 27 September 2026 · in French
Essai, avis et fiabilité des 2,2 HDI 136 chevauxFiches-Auto · Motoring press · consulted 27 September 2026 · in French
Mercedes-Benz OM640 engineWikipedia · Other source · consulted 27 September 2026
Mercedes-Benz W169Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mercedes-Benz W245Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Range Rover EvoqueWikipedia (inglés) · Other source · consulted 27 September 2026
Essai, avis et fiabilité des 2,2 HDI 204 chevauxFiches-Auto · Motoring press · consulted 27 September 2026 · in French
Essai Citroën C5 Exclusive + 2.2 HDI 200 TourerActu Automobile · Motoring press · published 2011 · consulted 27 September 2026 · in French
Essai Peugeot 4007 2.2 HDi DCS 6Caradisiac · Motoring press · published 7 April 2010 · consulted 27 September 2026 · in French
Citroën C-CrosserWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish