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Mercedes-Benz E-Class: CDI 4-Cylinder Diesel DPF Blockage (OM651 and OM654)

CDI 4-Cylinder Diesel DPF Blockage (OM651 and OM654) is a common engine fault on the Mercedes-Benz E-Class on the 2009–2021 cars, and we rate it major. Putting it right costs $600 to $2,800 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 23 documented faults on the Mercedes-Benz E-Class.

Vehicle
Mercedes-Benz E-Class
Engine
2.1L / 2.0L
Years
2009–2021
Fuel
diesel
Gearbox
auto
System
Engine

This page covers the Mercedes-Benz E-Class as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Mercedes-Benz E-Class faults23 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Diesel particulate filter yet. We would rather show none than show a picture of a different part.

What goes wrong

Both the OM651 (W212, 2009 to 2016) and OM654 (W213, 2016 onward) 2.0 to 2.1-litre diesel engines require diesel particulate filter regeneration via sustained highway driving. Cars used predominantly for short urban trips accumulate unburnt soot faster than passive regeneration can clear. Blocked DPFs trigger limp mode and require forced regeneration using specialist diagnostic equipment or DPF replacement. NZ and AU independent mechanics consistently report this as a common fault in city-used diesel E-Classes.

What you would notice

  • DPF warning light illuminated on dashboard
  • Power reduction or limp mode
  • Increased fuel consumption
  • Excessive white or sooty exhaust smoke

How to check it

Where to look. Exhaust system under car, forward of rear axle

  1. Check dashboard for any DPF warning light history.

  2. Ask the owner about primary usage pattern.

  3. Check whether forced regenerations have previously been performed.

  4. If a workshop inspection is possible: Use a diagnostic scanner to read DPF soot load percentage — above 75 percent indicates an imminent or existing blockage.

Parts involved: Diesel particulate filter.

What it costs to put right

$600 to $2,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the DPF warning light ever come on?”
  • “Is this car used mainly for short city trips or highway driving?”
  • “Has the DPF ever been cleaned or replaced?”

Now check the Mercedes-Benz E-Class you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Mercedes-Benz E-Class buyer questions

Is cdi 4-cylinder diesel dpf blockage (om651 and om654) serious on a Mercedes-Benz E-Class?

We rate it major and common on the Mercedes-Benz E-Class. Both the OM651 (W212, 2009 to 2016) and OM654 (W213, 2016 onward) 2.0 to 2.1-litre diesel engines require diesel particulate filter regeneration via sustained highway driving. Cars used predominantly for short urban trips accumulate unburnt soot faster than passive regeneration can clear. Blocked DPFs trigger limp mode and require forced regeneration using specialist diagnostic equipment or DPF replacement. NZ and AU independent mechanics consistently report this as a common fault in city-used diesel E-Classes.

How much does it cost to fix on a Mercedes-Benz E-Class?

$600 to $2,800 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Mercedes-Benz E-Class years are affected?

Our research records this fault on the 2009–2021 Mercedes-Benz E-Class. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Check dashboard for any DPF warning light history. Ask the owner about primary usage pattern. Check whether forced regenerations have previously been performed. If a workshop inspection is possible: Use a diagnostic scanner to read DPF soot load percentage — above 75 percent indicates an imminent or existing blockage. Look here: Exhaust system under car, forward of rear axle