[way318]

Hi, yesterday I picked up a 2012 Q5 Tdi with 114k on clock, car had previously been inspected by mechanic and checks done on DPF etc and all ok was given. I drove it home (approx. 250miles none stop) and when I parked up at home I noticed the revs where raised to 1000rpm which suggests is doing a DPF regen, but was surprised as thought it should have done that on such a long run, plus when turned engine off the cooling fans came on which I know is normal after a regen.

Plan to do diagnostic check when I get home from work to check dpf etc, hopefully all ok and may just have been a coincidence but my worry its something else. If it a sensor, then would be an easy fix, just hoping dpf is not dead.

With it being a 2012, I'm would guess someone may have had a similar experience and my know what it could be.

Thanks

 

[Steve B]

Hey, I have a 2013 tdi and once a week i do a 140 mile round trip commute. After those commutes the car sometimes shows signs of a regen (higher idle and fan running).

Sounds like your regen has taken place later in the journey due to soot levels as opposed to your driving conditions. With what you described i dont think theres any cause for concern.

 

[missile]

That sounds normal to me. If you are concerned, buy Carista and check DPF soot level

 

[way318]

That sounds normal to me. If you are concerned, buy Carista and check DPF soot level

Cheers, yes already got Carista and tonight I've checked soot level, reading was 11.13g, which I guess is good for a car of that mileage.

My other car has a reading of 22g and that's got less miles.

 

[way318]

When doing the scan on the car, I also got 2 other fault codes:

00256 (refrigerant pressure/temperature (G395), so I think the A/C sensor has failed.
00471 Controller for EGD electronically regulated absorption (J250)

Is there a way to test via Carista refrigerant pressure, just in case it just needs a re-charge?

Not sure what the 00471 is?

 

[missile]

11.13g is not too bad. However it will climb rapidly if you are not doing long enough journeys to initiate regen. 22g is bad and I would expect DPF warning to show soon. You ought to do forced regen or have it cleaned.

From a very old post >
Headlight aiming: 00471 - Controller for EGD electronically regulated absorption (J250)
The J250 refers to a fault with the control unit for the variable suspension dampers, shock absorbers in the common tongue, and before spending £376.78 on the part, 3C0 907 376 A Z0S, it could do with some detailed analysis of the car using the VAG diagnostic system Guided Fault Finding.

It needs deeper investigation into what the headlight controller is detecting as being faulty, I presume your reader is picking up that code at address 55 which is the headlight range control unit J745 but unlike VAS PC or VCDS, it does not tell you. The code stored in the J745 just says there is a problem with the J250 suspension controller but doesn’t specify what, the nature of the fault is not shown, such as is the J250 faulty or is there a fault between it and the headlight controller? The cars three level senders (front and rear left) are connected to the J250 and this data is then sent to the J533 Data bus diagnostic interface via the powertrain CAN bus and then to the J745 headlight controller, this data is a legal necessity for cars with gas discharge headlights to ensure the beam stays level as the cars ride height varies. The rear left level sender is also connected directly to the headlight controller. The car needs a code read that interrogates the J250 and both headlights

 

[way318]

11.13g is not too bad. However it will climb rapidly if you are not doing long enough journeys to initiate regen. 22g is bad and I would expect DPF warning to show soon. You ought to do forced regen or have it cleaned.

From a very old post >
Headlight aiming: 00471 - Controller for EGD electronically regulated absorption (J250)
The J250 refers to a fault with the control unit for the variable suspension dampers, shock absorbers in the common tongue, and before spending £376.78 on the part, 3C0 907 376 A Z0S, it could do with some detailed analysis of the car using the VAG diagnostic system Guided Fault Finding.

It needs deeper investigation into what the headlight controller is detecting as being faulty, I presume your reader is picking up that code at address 55 which is the headlight range control unit J745 but unlike VAS PC or VCDS, it does not tell you. The code stored in the J745 just says there is a problem with the J250 suspension controller but doesn’t specify what, the nature of the fault is not shown, such as is the J250 faulty or is there a fault between it and the headlight controller? The cars three level senders (front and rear left) are connected to the J250 and this data is then sent to the J533 Data bus diagnostic interface via the powertrain CAN bus and then to the J745 headlight controller, this data is a legal necessity for cars with gas discharge headlights to ensure the beam stays level as the cars ride height varies. The rear left level sender is also connected directly to the headlight controller. The car needs a code read that interrogates the J250 and both headlights

Thanks, I only found the code by doing a ECU scan, but it didn't come up when I did a normal fault code scan, which is strange. I will take it to my mates garage, for him to scan it.

I also got a '03207 Charisma Switch Module' fault on the ECU scan, but as the car doesn't have drive select, I guess I can ignore it.

Also noticed this morning, that can't open the boot via the boot switch located outside on the handle, it opens via the remote and also by the switch on the drivers door, is there a setting in the MMI to change that, I've looked on Carista but no option to change it?

Will see if I can test the switch to see if it working ok, if can't find a setting.

 

[missile]

Also noticed this morning, that can't open the boot via the boot switch located outside on the handle, it opens via the remote and also by the switch on the drivers door, is there a setting in the MMI to change that, I've looked on Carista but no option to change it?

There is an option in MMI to disable the boot handle. It is a security feature.

 

[way318]

There is an option in MMI to disable the boot handle. It is a security feature.

Thanks found it.

Went out to do a force regen on the car, took a reading first and Soot was down to 6.67g, but did the force regen any way. So during the cycle it went down to 0.96g, so looks good so far.

But after it had finished the force regen, i checked engine and oil temp. The oil temp seemed fine at 85deg, but coolant temp only got to 82deg after 20 mins on motorway and then dropped to 77deg after I came back onto normal roads, but my experience tells me that the temp should get to 90deg and stay there, so it seems as if the thermostat is faulty !!!

Also noticed that it takes turn over for longer for it to start once warm, where I would expect it to start at the first turn over, what would cause this? Fuel pressure / blocked fuel filter? Can you read fuel pressure from Carista?

Only had the car since Sunday, so starting to noticing a few issues 🙄

Any recommendation for trim removal tools, as need to remove passenger door pad, to check the noise the window makes when going down. Seen a few on eBay etc, but not sure how good quality they are and may break on first use. !!!

 

[missile]

Any recommendation for trim removal tools, as need to remove passenger door pad, to check the noise the window makes when going down. Seen a few on eBay etc, but not sure how good quality they are and may break on first use. !!!

I bought cheapest I could find from Amazon