[Rain/light recognition sensor Fault]

Hi,

anyone knows what this is about?

 

VCDS Auto-scan output:

934149 - Rain/light recognition sensor 
          B1366 76 [008] - Wrong mounting position
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 4
                    Reset counter: 126
                    Mileage: 272226 km
                    Date: 2019.12.12
                    Time: 18:08:17

[DPF active regeneration - 'boot it', or 'steady as she goes?']

46 minutes ago, nidza said:

From what I've learned reading analysis of temperatures on Seat TDI, revs aren't welcome in the same engine load, as they increase the airflow and actually reduce temperature of exhaust gasses. What increases temperature is engine load, not the revs. If you don't have hills, go straight, fast, at lowest feasible revs. 

 

This may be true for normal driving, but when regeneration is active fuel is injected in 4th stroke so that DPF heats up more quickly. So, I think, more revs, more heat to DPF.

 

32 minutes ago, Gabbo said:

Probably its about the same, so my philosophy is why not let it regen when you are driving the car somewhere you need to go rather than waste your time driving with no destination?

 

I tried this, and in winter I end up with DPF warning. Again, I cannot discern between DSG behavior in normal driving and during regeneration so I think is cheaper to switch it to manual and end it with higher revs.

[DPF active regeneration - 'boot it', or 'steady as she goes?']

1 hour ago, Gabbo said:

If the engine needed higher revs to regenerate it would be fairly easy to implement this in the software (and I'm pretty sure the DSG already holds gear a little longer when regen is active).

 

Imagine lots of everyday short trips (5-10 min drive) in town without hills. The system is dumb. Once it starts active regeneration it restarts it every time you start the car again (and get past 50 km/h I think) and in a few days driving like this you get DPF light in instrument cluster. Even if you don't end up with DPF light, it consumes extra injected fuel every time you start the car. So my method is switch DSG to manual -> get at least 2500 rpm -> drive like this 5 - 10 min -> park the car and see if revs are below 1000 rpm and start/stop engaged, if not drive some more like this until it completes.

 

If the higher revs were implemented in the software it would be even more obvious of active regeneration taking place. Maybe it's part of the VW policy to not do so.

[DPF active regeneration - 'boot it', or 'steady as she goes?']

27 minutes ago, Gabbo said:

With the DSG the ECU controls the gearing & thus engine revs. If regeneration needed higher revs then it would automatically just stay in the higher gear for a little bit longer.

 

I don't agree. ECU does nothing to DSG operation during active regeneration. No higher revs, no different regime of shifting gears. Nothing. Driving experience is the same like normal driving. Only clues of active regeneration taking process is disabled start/stop at idle, idling at 1000 rpm and subtle engine shake if you floor it when stationary (rpm goes to 2500 rpm).

[DPF active regeneration - 'boot it', or 'steady as she goes?']

Makes sense. But if you live in a small town without hills and you make only short trips, revs are inevitable. Especially in cold weather.

[DPF active regeneration - 'boot it', or 'steady as she goes?']

On 15/09/2018 at 18:14, ian_feel_keepin_it_reel said:

Just drive it normally. As it's automatic if the active regen required high revs the engineer's would just program it to hold a lower gear during a regen.

 

On my 2013 2.0 TDI Estate that's not true. I must switch to manual to obtain higher revs to end regeneration.

 

 

[Sponge thingy]

Thanks aki78 !!

[Sponge thingy]

Hi. Does anyone knows where can I buy this sponge things (marked red)? One of them was missing when I bought the car from a previous owner. I have bad vibrations at about 950 rpm (2.0 TDI) Thanks!

[Increased sensitivity of the throttle pedal]

Gizmo68 in Superb MkIII VCDS Adaptations post says

Quote

Increased sensitivity of the throttle pedal

 

Controller 01- Engine

 

07 - Coding 

 

Byte 0, Bit 0-2,

 

Change from Škoda (01) to AUDI (02) this will dramatically reduce lag on pressing accelerator pedal

 

Is this also applicable to Octavia Mk3 or will it generate DTCs?

[error: airbag]

multi collision brake fault it was. DTCs cleared, didn't come back. Thanks once again.

[error: airbag]

Thanks guys. Generic OBD scanner shows no fault codes. I will try to erase it when I get hold of VCDS.

[error: airbag]

Keep seeing this message every startup for a few days. Anyone had this one? Common culprits on mk3 for it? I don't have vcds yet to check it out. It's 2.0 TDI DSG MY13 220k km. Thanks