Short version:

Does anyone know if VCDS can be used to reset the Calculated Soot value of the Diesel Particulate Filter?

Longer version:

My wife's car is a 2008 Octavia Estate VRS 170CR (03L-906-022GB) with 61k miles

Her DPF light came on and a local mechanic advised her that it was probably a build up of soot from too much urban driving.

Alas I didn't read the many threads here related to DPF problems before taking in on a long spin hoping to clear it out.

Sure enough, the problem got worse with DPF, engine management lights on, coil flashing and car in limp mode.

She took it to the local main dealer, who replaced a throttle part but couldn't get the DPF to regenerate as they said it was too full.

They reckoned that the throttle problem has blocked the car from regenerating and it was now too late. They quoted E1800 to replace the DPF.

I got the diagnostic print out from them. The car originally had the following DTCs;

P145F: Air flow in regeneration mode too high sporadic

P2100: Throttle valve control part open circuit

P2103: Throttle valve control module, servo-motor activation signal too high, sporadic

P2111: Throttle valve control module, sticks when open, sporadic

P2112: Throttle valve control module, sticks when closed, sporadic

P2463: Diesel particulate filter, soot accumulation excessive

I looked into getting the DPF removed and a helpful mechanic (Joe Power) suggested that I try replacing the DPF differential pressure sensor (G450) first.

I bought a new G450 sensor from the main dealer, installed it myself and cleared the remaining P2463 DTC using VCDS.

The Measured DPF Soot value is now down around 20%. (It varies slightly as you drive)

The DPF and flashing glow plug lights are still on though and the Calculated DPF Soot value remains at 48%.

From what I've read, the car won't allow a forced regen if this figure is above 45%.

Is there a way to tell the car to recalibrate the Calculated Soot value now that the G450 has been replaced?

How is this value reset when a new DPF is installed in the car?

So far, I have tried

1) Security code 12233, followed by Adaptation Channel 13, set to 1 (try to force regen)

2) Coding 11, 21295 (try to force regen?)

3) Coding 11, 30605 (try to start G450 adaptation?)

4) Putting a DFP cleaning additive into the diesel to help it clear naturally

Any suggestions or codes to try to reset this would be gratefully appreciated,

Daithí

ps: I realise that regenerating a full DPF carries a risk of fire but this one is only 20% full

Have a look here, http://wiki.ross-tech.com/wiki/index.php/Diesel_Particle_Filter_Emergency_Regeneration

Have a look here, http://wiki.ross-tech.com/wiki/index.php/Diesel_Particle_Filter_Emergency_Regeneration

Thanks Andy,

Unfortunately, I already tried regeneration as outlined on that page but the car won't regenerate while the calculated soot value is above 45%.

The ECU decided that the soot is above 45% based on faulty sensor info and now that I have replaced the faulty sensor, I need to reset this calculated value.

The g450 sensor needs to be adapted to the engine ECU or the ECU still uses its default value from before, this needs to be done before the vehicle is run. This is a different practice from resetting the ash mass value which should only be done when the DPF is replaced. Forced regen is possible given all sensors are working ok up to 90% saturation above that the risk of fire forbids it.

The g450 sensor needs to be adapted to the engine ECU or the ECU still uses its default value from before, this needs to be done before the vehicle is run. This is a different practice from resetting the ash mass value which should only be done when the DPF is replaced. Forced regen is possible given all sensors are working ok up to 90% saturation above that the risk of fire forbids it.

Thanks Tech1e,

How does one adapt the g450 sensor?

Start by posting an Auto-Scan with the actual fault codes and freeze frame information.

Hi All,

 

First I would like to apologize that I am using this topic. I have tried with the search, but nothing came up and I decided to continue in this one. 

 

I have a Skoda Fabia II TDI 1.6 2011 model and it needs new DPS. Does anyone know how to adapt the sensor using ODIS 3?

 

Greatly appreciated!

 

Nick