We have thoroughly studied the Audi 2.0 CDNB engine and in this article we will examine its specifications, problems, failures, service life and reliability. We will also look at operating features: which oil to use, how often to change it, and what fuel consumption to expect under real-world conditions.

Problems and Failures of the Audi 2.0 CDNB Engine

The Audi 2.0 CDNB is a 2.0-liter TDI common rail diesel engine used in various VW Group models from around 2008 to 2015. While generally robust, it has several known issues that owners should be aware of. Below are the most common problems, typical mileages, symptoms, and approximate repair costs.

Common Issues

  • Injector failureAt 100,000–150,000 km, injectors can fail due to carbon buildup or electrical issues. Symptoms include rough idle, misfires, and excessive smoke. Repair cost: around 800–1,200 EUR for a set.
  • EGR valve cloggingThe EGR valve becomes clogged with soot, typically by 80,000–120,000 km, leading to reduced power, poor fuel economy, and engine warning light. Cleaning or replacement costs about 300–500 EUR.
  • DPF (Diesel Particulate Filter) issuesFrequent short trips can cause the DPF to clog, leading to regeneration issues and reduced performance. Replacement costs 1,500–2,500 EUR if not cleaned in time.
  • Timing chain stretchThe timing chain can stretch, especially if oil changes are neglected, causing rattling on cold start and potential engine damage. Replacement costs around 1,000–1,500 EUR.
  • Oil pump drive failureSome early versions had a balance shaft module that could wear, leading to low oil pressure and engine failure. This is a known issue and usually requires a new balance shaft unit (about 1,200–1,800 EUR).
  • Turbocharger issuesThe turbo can develop wastegate rattle or fail due to oil starvation or foreign object damage. Replacement costs about 1,000–2,000 EUR depending on the turbo model.

Prevention is key. Use high-quality 5W-30 oil meeting VW 504 00/507 00 spec, change it every 10,000 km or annually, and ensure regular long drives to help DPF regeneration. This can prevent many of the above issues.

Reliability and Service Life

The Audi 2.0 CDNB engine is considered reasonably reliable if well-maintained. VW didn't officially state a service life, but real-world data suggests that with proper care, it can last 300,000 km or more before major overhaul. Neglected engines may need significant work by 150,000 km. High-mileage records of 400,000+ km exist among owners who followed strict maintenance schedules.

Well-maintained examples typically experience few major issues, but neglected ones suffer from timing chain stretch, oil pump problems, and turbo failure. Regular oil changes and using the correct oil are critical for longevity.

Technical Specifications

Engine Specifications
  • Displacement: 1,968 cc (2.0 L)
  • Configuration: Inline-4, turbocharged diesel
  • Bore × Stroke: 81.0 mm × 95.5 mm
  • Compression ratio: 16.5:1
  • Aspiration: Variable-geometry turbocharger, intercooled
  • Power: 140 hp (103 kW) at 4,200 rpm
  • Torque: 320 Nm at 1,750–2,500 rpm
  • Fuel system: Common rail direct injection
  • Emission standard: Euro 5 (with DPF)
  • Timing drive: Chain (two chains: camshaft and balance shaft/ oil pump)
Maintenance Data
Oil Specification Oil Capacity Oil Change Interval Air Filter Interval Fuel Filter Interval Cabin Filter Interval Timing Chain Real-world Fuel Consumption
5W-30, VW 504 00/507 00 4.6 L (with filter) Factory: 30,000 km / 2 years 60,000 km 60,000 km 15,000 km or annually Inspect at 120,000 km; typically lasts 150,000–200,000 km 6.5–8.0 L/100 km (mixed)
— — Recommended for longevity: 10,000 km / annually — — — — —

Which Car Models Used This Engine

  • Audi A4 (B8, 2008–2015)2.0 TDI (143 hp) – CDNB code
  • Audi A5 (8T, 2009–2012)2.0 TDI (143 hp) – CDNB code
  • Volkswagen Passat (B6/B7, 2008–2014)2.0 TDI (140 hp) – CDNB code
  • Volkswagen Golf (6th gen, 2009–2012)2.0 TDI (140 hp) – CDNB code (though some had CBAB, not CDNB)
  • Volkswagen Tiguan (2009–2015)2.0 TDI (140 hp) – CDNB code
  • Škoda Superb (2010–2015)2.0 TDI (140 hp) – CDNB code
  • SEAT Exeo (2009–2013)2.0 TDI (143 hp) – CDNB code

Owner Reviews

Here are real-world experiences from owners of vehicles with the Audi 2.0 CDNB engine:

Owner Feedback

  • Mike, UK – 2010 Audi A4 Avant, 185,000 kmOverall a great engine. I make sure to do oil changes every 10k km and use only the VW spec oil. The only issue so far was a failed EGR valve at 120k km, which cost about £400 to replace. Fuel economy is around 7.0 L/100 km in mixed driving. I'd buy again.
  • Elena, Germany – 2011 VW Passat, 150,000 kmThe car is comfortable, but the DPF gave me trouble at 90,000 km because I mostly drive short distances. I had to do a forced regeneration at a garage. Now I take it on the highway regularly and it's fine. Consumption is about 6.5 L/100 km.
  • Tom, Australia – 2009 Skoda Superb, 220,000 kmNo major issues until 200k, then the timing chain started rattling. I replaced it proactively before it broke. Cost around AUD 1,800. Otherwise very reliable and smooth. I do regular servicing, which I think is the key.
  • Sara, Netherlands – 2012 Audi A5, 98,000 kmI love the engine's torque. Only problem was the oil pump drive module, which failed at 95k causing low oil pressure warning. I stopped immediately and had it replaced under warranty. The dealership said it's a known issue on this engine.
  • Jing, China – 2013 VW Tiguan, 120,000 kmThe engine runs well, but the injectors started to fail at around 110k, leading to rough idle. Replacing all four cost about 1,000 EUR. Other than that, I'm satisfied. It uses about 7.5 L/100 km in the city.

Verdict / Final Thoughts

The Audi 2.0 CDNB is a solid, efficient diesel engine that rewards proper maintenance. It offers good performance and fuel economy, making it a sensible choice for long-distance drivers. However, potential buyers should check the service history, especially for regular oil changes, and inspect the timing chain and oil pump module. If well-maintained, it can provide many miles of reliable service. It's best suited for those who are willing to follow a strict maintenance schedule.