Audi A3 2.0 TDi (CFFB) regenerates dpf too often
Discussion
Hello All,
I have some problem with my A3. There are symptoms that can help to find the problem, but I would like ask for some advice, what else should be checked.
The car has a 2.0 TDi engine with cffb engine code (140 hp, fwd), with 280k kilometers/174k miles and 8 years old now.
So the symptoms:
-worse fuel consumption (but enough engine power, engine is not lazy)
-dpf regereates very often, about every 180-250km/100-150 miles independently from where used (city or highway)
I bought the car with this symptoms I don't know how many miles was driven so. Sadly the original dpf is died a month ago, I saw black smoke when regen was active.
Later I got a fault code too:
5120 - Oxygen (Lambda) Sensor B1 S1
P2196 00 [237] - Signal too High (Rich)
So I decided to fix every bad part of the car. Started with a new DPF last week, and with a new turbocharger.
After the service, I started to use the car again, but fuel consumption remained worse and dpf regens still very often, but I cannot see black smoke now, and exhaust is clean. And there is no fault code.
Yes, now I know that the dying of dpf is a indicator, that something else is bad.
So my idea was that the too rich signal can occur not just about too less air, but too much fuel. I don't know anything about the injectors are in used but I think they are still the original ones. I tried to check injector amount deviaton with/in VCDS with normal engine temperature, at idle, and while I'm driving. I don't know that measuring it while driving is relevant or not, but I made a graph from the logs:
As I see, injector in cylinder 3 injects too much fuel, when I drive more and more. Am I correct?
Did you guys are familiar with this kind of measuring?
I don't want to spend tons of money, for replace every part of the car, I just want to find the bad part(s).
What do you think, what should be measured?
Thanks for your help
I have some problem with my A3. There are symptoms that can help to find the problem, but I would like ask for some advice, what else should be checked.
The car has a 2.0 TDi engine with cffb engine code (140 hp, fwd), with 280k kilometers/174k miles and 8 years old now.
So the symptoms:
-worse fuel consumption (but enough engine power, engine is not lazy)
-dpf regereates very often, about every 180-250km/100-150 miles independently from where used (city or highway)
I bought the car with this symptoms I don't know how many miles was driven so. Sadly the original dpf is died a month ago, I saw black smoke when regen was active.
Later I got a fault code too:
5120 - Oxygen (Lambda) Sensor B1 S1
P2196 00 [237] - Signal too High (Rich)
So I decided to fix every bad part of the car. Started with a new DPF last week, and with a new turbocharger.
After the service, I started to use the car again, but fuel consumption remained worse and dpf regens still very often, but I cannot see black smoke now, and exhaust is clean. And there is no fault code.
Yes, now I know that the dying of dpf is a indicator, that something else is bad.
So my idea was that the too rich signal can occur not just about too less air, but too much fuel. I don't know anything about the injectors are in used but I think they are still the original ones. I tried to check injector amount deviaton with/in VCDS with normal engine temperature, at idle, and while I'm driving. I don't know that measuring it while driving is relevant or not, but I made a graph from the logs:
As I see, injector in cylinder 3 injects too much fuel, when I drive more and more. Am I correct?
Did you guys are familiar with this kind of measuring?
I don't want to spend tons of money, for replace every part of the car, I just want to find the bad part(s).
What do you think, what should be measured?
Thanks for your help
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