Modern diesel engines, especially the 2.0 TDI with 150 and 200 hp , are known for their efficiency and performance. However, they are not free from problems, especially when used primarily in urban environments. Among the most common problems encountered before 50,000 km are lambda sensor failure and premature blockage of the particulate filter (DPF) .
In this article, we'll analyze the causes, symptoms, and possible solutions to these problems, also providing some useful tips to prevent future damage. If you're a motorist, mechanic, or diesel enthusiast, this guide is for you.
What is the lambda probe and why does it fail?
The lambda probe measures the amount of oxygen in the exhaust gases to optimize combustion and reduce emissions. In diesel engines, it is essential for the proper functioning of the DPF and the SCR (selective catalytic reduction) system.
Common causes of failure:
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Accumulation of particulate matter or combustion residues
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Mainly used in cities (short cycles, incomplete regenerations)
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Poor quality fuel
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Malfunctions of other engine sensors
The diesel particulate filter (DPF): operation and problems
The DPF (Diesel Particulate Filter) is designed to trap particulate matter produced by combustion. Periodically, the filter regenerates by burning the accumulated residues. However, on many diesel cars, especially those driven primarily in urban areas , the regeneration process can be interrupted.
Consequences:
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Early clogging
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Increased exhaust back pressure
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Turbo and engine damage
Symptoms of lambda sensor or DPF problems
✅ Engine light on : one of the first warning signs. OBD diagnostics detects errors related to the air/fuel mixture or DPF pressure.
✅ Power loss : The engine goes into “limp” mode to protect the components.
✅ Increased fuel consumption : incorrect combustion management or a clogged DPF require more fuel to achieve the same performance.
How to prevent these problems
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Avoid exclusive city use : occasionally drive on stretches of highway or motorway to allow the DPF to regenerate.
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Perform regular maintenance : use only quality oil and filters.
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Check the exhaust system periodically : an electronic diagnosis every 10,000 km can detect malfunctions before they become serious.
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Use regenerating additives : some products help clean the DPF and keep the lambda probes efficient.
Recommended interventions and costs
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Lambda sensor replacement : from 150 to 300 euros depending on the model.
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Professional DPF cleaning : approximately 200-400 euros.
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DPF replacement : in severe cases, it can exceed 1,500 euros.
Intervening promptly is essential to avoid further damage and high costs.
Conclusion
If you own a 2.0 TDI diesel car and notice the symptoms described, don't ignore them. Prompt intervention can save you from significant costs and keep your vehicle running efficiently over time.
For those looking for original or compatible spare parts for lambda sensors and DPFs, Autoricambi Tritella is the go-to place for fast deliveries and expert advice.
FAQ
🚗 What is the lambda probe in diesel engines for?
It serves to regulate the air/fuel ratio to optimize emissions and engine operation.
⚠️ What are the symptoms of a clogged DPF?
Engine light on, loss of power, abnormal fuel consumption, frequent regenerations.
🌡️ Can I clean the DPF myself?
There are helpful additives, but for effective results, professional cleaning is recommended.
🏢 Where can I buy a lambda probe and DPF filter?
At Autoricambi Tritella , both online and in physical warehouses, with a wide availability of spare parts for 2.0 TDI diesel engines.
