Alright, children (
@BreyoGP, I told you I'd have it ready). Gather ‘round for this celebratory fact...in 3 parts. It's a hefty one, but it’s time for another episode of
F A C T S. Today, we’re starting a new chapter – diving into stories of deception and rampant cheating in the automotive industry in a series that I’ll figure out a name for later. This time, we’re going to look at the latest great con in automotive history; Dieselgate.
Dieselgate, for the uninitiated, was quite possibly the largest swindling of the buying public in the automotive world. Volkswagen had sold their TDI diesel engines on the false premise that this new generation of diesel engines was cleaner and more efficient than gasoline, duping nearly 11 million eco-conscious losers who didn't know any better.
Ye- WAIT
Oh.
So yeah. I was one of those 11 million, and to say I was displeased would be an understatement. With that in mind, let’s discuss at length both why I’m not letting go of mine for the next 4 years, and also why I’m never buying another VW after that.
The Dieselgate saga all started back in 1999. Well, VW had been marketing diesel versions of the Rabbit since the late 70s. But in 1999, the EPA began tightening down on old requirements. The new Tier 2 diesel emissions requirements decreased the nitrogen oxide emissions limits, among others. Like the fuel economy and emissions requirements set out in the early 70s, manufacturers were given a phase-in period, with 2009 being the hard limit for automakers to meet those requirements.
It’s worth mentioning that diesel doesn’t have the same connotations in America that it does in Europe. Buyers frustrated with the lack of options can thank General Motors and their disastrously unreliable Oldsmobile diesel. Introduced in 1978, it was so unreliable it failed to even be tested properly by the EPA because of the nine cars sent to Ann Arbor, seven had developed transmission problems, and all nine experienced an engine fault in one form or another. More on this absolute shitshow of an engine another time. So thanks to this engine, diesel cars would be seen as unreliable, noisy, and dirty by the American public. VW and other manufacturers had their work cut out for them.
This has aged almost as badly as VW's TDI ads
The simple answer to “why did VW survive with diesel when nobody else did” is simple; VW had marketed their diesels as economy cars, where the tolerances for noise, vibration, and harshness were higher. GM, on the other hand, had opted to put theirs in higher-end Oldsmobiles and Cadillacs, which ruined the refined images of the cars they were trying to push. The Rabbit was a much simpler, cheaper car. And the primitive diesels, while rough, returned excellent fuel economy. And with refinement (and the addition of a turbocharger and common-rail injection) their newer Turbocharged Direct Injection (TDI) diesels became a staple of the brand for the 1999 model year.
For car buyers seeking a cleaner car without the price tag or battery anxiety that came with hybrids at the time, VW offered an alternative as the only practical choice for a diesel in a passenger car. The cars were often advertised with the moniker “TDI Clean Diesel,” and appealed to the environmentally conscious, but frugal driver. VW did a lot to appeal to this demographic, even offering warranty coverage for those who opted to use biodiesel or veggie oil instead of traditional fossil fuels or oils.
And this is one misconception I want to point out about diesel emissions. Pound for pound, even a cheating TDI will be better for the environment than a comparable gasoline engine. Carbon output is higher per litre consumed, but the difference in fuel economy makes emissions
per driven mile less than a comparable gas car. In Europe, the market average for CO2 emissions is approximately 200 g/km from gasoline, versus 120 g/km from diesel.
What a diesel
is, is worse for your health. The lower CO2 emissions are offset by significantly higher amounts of nitrogen oxides and particulate matter. Both of these are aggravating factors or causes of respiratory illnesses including asthma, and the latter is a contributor in the formation of smog. Because of Dieselgate, an estimated 59 premature deaths are expected to occur in the US due to the increased emissions output.
But back to our story; by 2005, VW was anticipating the EPA’s Tier 2 rules coming into effect. VW showed an interest in licensing Mercedes’ Bluetec emissions control, but ultimately decided to use their own design. And partnered with Bosch, they set forth on turning their TDI into what they wanted to call TDI Clean Diesel.
But development was slower than anticipated, and VW found themselves with a sudden time crunch. VW initially suspended sales as they tried to bring their cars into compliance, but they couldn’t quite meet the standard. Specifically, VW found themselves unable to meet the new requirements without making some sacrifices. The EPA’s limit of 0.043 g/km of NOx emissions was the most stringent in the world – even more so than Europe’s Euro5 category (in which some models were certified) which had a limit of 0.18 g/km.
Volkswagen had at the time two methods of TDI emissions control, depending on the model. The first is called Lean NOx Trap, and involves the use of a Diesel Particulate Filter (DPF). The second involves the use of a secondary fluid called diesel exhaust fluid, which functions similarly, and is called Selective Catalytic Reduction (SCR), often used in conjunction with the first method. Both methods are used to control NOx and PM emissions, but the first involves dumping unburnt fuel to clean the filter (resulting in a fuel economy penalty), or the consumption of an additional fluid, which was extra maintenance. Bosch still hadn't made a system that could perform to par by 2007, at a point when the 2009 model year was supposed to be nearing showroom-ready. And they even warned VW that using their software in its unfinished state would be illegal. VW couldn’t make either system work while offering the same or better economy and performance as previous models, so they got crafty.
Graphic of both emissions control types in tandem, similar to the setup in the VW Passat
Instead of permanently halting sales and taking the hit for a delayed product, VW instead came up with a workaround. You see, VW was familiar with EPA methodology. They knew that the EPA (and most agencies) tested all cars in a uniform manner, and that they would put the car on a dynamometer.
A "rolling road," or chassis dynamometer
Essentially, the car would be held in place on a machine, while the driving wheels sat on rollers with a certain resistance to simulate driving load. But when this happens, the non-driven wheels are stationary, and modern traction control systems will freak out and try to reduce engine power, making the car unable to complete the test – a situation that is nearly impossible in real world driving unless you drove off with the handbrake on while it was icy out. The EPA
asks for manufacturers to provide a dyno mode, and this is where VW slipped in their software.
With the emissions controls only coming on when the car detected that it was on a dyno, it could engage the emissions control systems and pass the test, with the consumption penalty being virtually undetectable in the short time span of the test. But once it was on the road, these systems were disengaged, giving drivers the performance and economy they were advertised. Neither of the parties would suspect a thing.
The 2009 unveiling of the GCJ's Green Car of the Year
So in 2008, VW introduced their new “Clean Diesel” with much fanfare for the 2009 model year. The 2009 Jetta TDI would go on to win Green Car of the Year (which was rescinded in 2015), and VW ran numerous ad campaigns touting the cleanliness of the TDI engine that have all aged
spectacularly poorly: