u/Devve2kcccc

Hi everyone,

I recently bought a Passat B7 1.6 TDI, and knowing these engines can have injector-related problems, I’ve been keeping an eye on the injector correction/deviation values.
The car currently has 210,000 km. Injectors 1 and 4 were replaced less than 2 years / ~20,000 km ago, so they are relatively new. However, I’m now concerned that injector 2, and possibly injector 3, may be starting to fail.

Symptoms

Sometimes, when starting the engine cold, it seems to misfire or have poor combustion for a few seconds. The RPM fluctuates slightly and then stabilizes. It’s not a severe misfire, but I can tell the engine isn’t running as smoothly as it should.
At warm idle, I also notice some vibration through the car. The engine sounds relatively normal, but I can feel that it isn’t completely smooth. When I switch the A/C on at idle, the engine note/behavior changes noticeably.

On the highway, however, the car runs very well. It has good power and is able to complete DPF regenerations normally.
My other concern is the DPF regeneration frequency. It seems to want to regenerate approximately every 50 km, which feels far too frequent. I’m wondering if poor combustion from one or more injectors is producing excessive soot and causing the DPF to load very quickly.

Looking at the injector deviation/correction values, injector 2 looks clearly suspicious to me, but I’m not sure how to interpret injector 3.

The VCDS logs were taken at cold idle, while the Car Scanner readings were taken with the engine hot, during or shortly after a DPF regeneration, so I understand the values may not be directly comparable.

For anyone familiar with the 1.6 TDI:
Does injector 2 look like it is failing? What about injector 3?

Would you replace injectors 2 and 3 at this point, or should I investigate something else first?

And could faulty injectors realistically explain the rough cold starts, vibration at idle, and DPF regenerations every ~50 km?

Thanks!

Hi. Is it normal for the high-pressure fuel pump to make this noise while the car is regenerating the DPF, at idle?
It only makes this sound during DPF regeneration. During normal idle, when revving, or even at high RPM, it doesn’t make any noise.

I’m trying to perform the injector quantity adaptation. I follow the correct procedure, and VCDS starts running the adaptation after I press the accelerator. However, the engine doesn’t rev up—it just stays at idle with the glow plug light on. VCDS shows the procedure as “Running.”

What can be? Engine at temperature. A/C and lights off. Tank around 1/4.

I’m trying to perform the injector quantity adaptation. I follow the correct procedure, and VCDS starts running the adaptation after I press the accelerator. However, the engine doesn’t rev up—it just stays at idle with the glow plug light on. VCDS shows the procedure as “Running.”

What can be?

Hi everyone,
Last week I replaced the timing belt kit along with the oil pump belt on my 1.6 TDI. To do this, the oil pan and oil pump pickup tube were both removed and thoroughly cleaned, meaning about 99% of the old oil was completely drained.
After reassembly, I initially filled it with 4.3L of fresh oil. After running the car to fill the new oil filter, the level dropped a bit as expected, so I topped it up until I got a reading at the MAX line.
However, checking it today, I noticed something odd:

Side 1 of the dipstick: Shows a perfect reading right at the MAX line.

Side 2 of the dipstick: Looks slightly higher, reading a bit above the MAX line.

Is this higher reading just oil residue being wiped off the inside of the dipstick tube when I pull it out, or could I have slightly overfilled it without realizing? Should I drain a small amount of oil to be safe, or is this completely fine to leave as is?
Thanks for your help!

Hi everyone. I recently bought a Passat B7 1.6 TDI CAYC with 209,000 km. There was no history of the timing belt kit ever being replaced, although the car had received regular maintenance every 10,000 km.
I bought a complete timing belt kit with a new water pump, and while doing the job, I was also advised to replace the oil pump belt. I’m very glad I did.
I was shocked by how bad the old oil pump belt was. The first time I tried to bend it after removing it, it simply snapped.
Keep in mind, this car had been regularly serviced throughout its life.
So, if you have a 1.6 TDI CAYC and don’t know when the oil pump belt was last replaced, be careful. Don’t wait, replace it. It’s a small part that can potentially save you from a much bigger problem.

Hi, new to TDI engines and VW group expansion tanks. What is the correct max level?

Hi,
I bought a Volkswagen Passat B7 with the 1.6 TDI engine. Injectors #1 and #4 were replaced in 2024 and 2025, while injectors #2 and #3 are still the original factory ones.
Using an OBD scanner, I noticed that the injection correction values (deviation) for the two original injectors are quite high, while the newer injectors appear to be compensating. Am I interpreting this correctly?
At the moment, I don’t have any noticeable drivability issues. The engine idles steadily, but I can feel a slight vibration inside the cabin, which makes me wonder if it’s caused by imperfect fuel injection. There’s no loss of power, but I have noticed that the DPF seems to clog or require regeneration more frequently than expected.
The newer injectors have less than 20,000 km on them.
Would replacing injectors #2 and #3 with two brand-new VDO injectors likely solve the injection correction imbalance? Is it reasonable to expect that installing four injectors with similar wear would bring the correction values back within specification and reduce the vibration, or could there be another underlying cause?

Hi, what do you think of this timing belt? I recently bought the car and don’t have any service history showing that the timing belt kit was ever replaced. The previous owner had the car from 180,000 km to its current 209,000 km and never changed it. Does this look like the original belt from 2011?

Hi everyone,
A relative of mine needs to sell his Passat 1.6 TDI (B7) due to financial difficulties. He is offering it to me at a very good price for the Portuguese market.
I know this engine has a reputation for the classic chronic injector failures.

However, this car has already had two injectors replaced with the updated, corrected version (the ones ending in "S" / Continental-VDO).

I am fully aware that the remaining two original injectors will likely fail sooner or later. My question is: once I eventually replace those other two with the updated "S" version, will the engine be completely reliable on that front? Or are all versions of these 1.6 TDI injectors inherently problematic?

Car details:
Mileage: 210,000 km
Maintenance: Excellent history. It has been serviced strictly on time, with the last 5 oil changes done every 5,000 km.

Should I go ahead and buy it, planning to replace the remaining two injectors when the time comes?

Thanks for your advice!

Also, do the sound looks fine?

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Zona Braga / Barcelos

Boas, ao analisar um carro de familiar, descobri que os injetores estavam rodeados de oleo, tipo uma poça. Este carro ja levou 2 injetores novos, sendo o ultimo à 1 ano. E acredito que se tivesse assim por aquela altura , teriam alertado. Sera a junta da tampa de válvulas que esta a começar a ceder?

Ou simplesmente sera oleo derramado durante uma manutenção? O nivel de oleo do carro esta no maximo, e ja vai ha mais de 5mil kms desde a ultima manutenção.

Ha outra possivel causa?

Obrigado

Boas.

Após várias pesquisas, não tenho conseguido encontrar este motor em lado nenhum. Os meus pais têm uma Mercedes Sprinter 412D de 1998, com cerca de 700.000 km. Infelizmente, o motor já está a acusar a idade e está a consumir bastante óleo. Suspeitamos que possa ser dos segmentos gastos, do turbo ou até de ambos.

Além disso, existe uma fuga de água na parte traseira da cabeça do motor. De momento o problema está controlado com um tapa-fugas, mas mais cedo ou mais tarde será necessário desmontar a cabeça para reparar tudo em condições.

Como a carrinha foi pintada recentemente e continua em muito bom estado geral, os meus pais não têm qualquer intenção de a vender. É uma verdadeira carrinha de guerra e queremos mantê-la por muitos anos.

Por isso, estamos à procura de um motor igual para montar na carrinha e ficar com o motor atual para reparar com calma e guardar como suplente.

Alguém sabe onde poderá haver um motor destes disponível? Alguma sucata que tenha uma Sprinter 412D para peças? Ou algum site onde seja possível encontrar este motor?

Obrigado desde já por qualquer ajuda.