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Discussion Starter #1
After checking various things on diagbox like additive level (half full), pump working, amount of soot (says 18% and should clear to near 0% on next regen), 287km since last performed regen, etc I have rightly or wrongly come to the conclusion my DPF is fine and simply Peugeot have decided that I have done enough miles now (127k) to warn me "Risk of filter clogging" and they want me to spend money. I have seen in diagbox where I can reset the additive level etc but for the life of me I can't find where I can tell it I have a new filter replaced. Can anyone point me in the right direction.

Diagbox
1.6 diesel 308 SW 2008
127k ish

All runs fine except for the clog warning on startup which is annoying.

Thanks in advance guys.
 

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Discussion Starter #3
Thanks for the reply, it's where I reset it to tell the car I have had it replaced although it hasn't been that I am struggling to find. I will take another look tomorrow. Found where I can reset the fluid but not where I can reset the DPF.
 

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DPF /FAP Reset

Hi, How do you know the DPF is not blocked? I ask this as I get the same warning up and have had to change the DPF. On advise of a local garage who are experts on Pugs, the DPF was blocked and this caused excessive back pressure apparently when I drove the car hard uphill overtaking an old school bus, this back pressure caused the turbo to fail. So beware, make sure the DPF is deffo not blocked. I am doing the rectification work myself, a new DPF and a new core for the turbo plus oil pick up strainer, turbo oil pipe and bango filter changed. But looking at the state of the old ones the lube system is not to blame as there is no sign of oil starvation, strainer and filter being clean. So I am agreeing with garage that back pressure must have caused the turbo failure.
The job is nearly done but I need to establish that the regen system is working, can you advise how to check this out, clearly something caused the DPF on my car to block (1.6 HDI 2008 SW). Surely if the regen sysetem is working the DPF should not get blocked?
 

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Discussion Starter #5
Hi, How do you know the DPF is not blocked? I ask this as I get the same warning up and have had to change the DPF. On advise of a local garage who are experts on Pugs, the DPF was blocked and this caused excessive back pressure apparently when I drove the car hard uphill overtaking an old school bus, this back pressure caused the turbo to fail. So beware, make sure the DPF is deffo not blocked. I am doing the rectification work myself, a new DPF and a new core for the turbo plus oil pick up strainer, turbo oil pipe and bango filter changed. But looking at the state of the old ones the lube system is not to blame as there is no sign of oil starvation, strainer and filter being clean. So I am agreeing with garage that back pressure must have caused the turbo failure.
The job is nearly done but I need to establish that the regen system is working, can you advise how to check this out, clearly something caused the DPF on my car to block (1.6 HDI 2008 SW). Surely if the regen sysetem is working the DPF should not get blocked?
Hi, whilst I haven't physically had the DPF off for a visible look I have had Diagbox on the car and it has told me the following on most recent check.

Diagbox stated that it was 18% filled but should return to around 0% on next regen, 287km since last regen (so obviously did a working regen about 287km ago). Fluid was showing as about 1.3ltr in bag/tank. Actuators were activated and could be heard working on fluid pump.

Car seems to drive fine and mpg seems ok for the sort of miles I get / driving
conditions.

oh... and passed MOT yesterday with only an advisory on a slightly corroded brake pipe yesterday so happy MOT for £25 :)

I currently get the warning as I believe it just starts after so many miles on peugeots from what I have read. Currently 127k on the vehicle so I assume after 100k peugeot want money off me. The problem I have currently is I have a slow fan speed error that I can't get rid of and I can't do a DPF reset on diagbox till ALL errors are cleared. Fan runs full speed when required and I have changed the resistor but hasn't changed anything. Assuming the fan works as it is running on full speed and assuming the resistor is ok as it's new I am next assuming is wire related between resistor and fan. Fuses all check out ok. Any advice from this point appreciated though.
 

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DPF Differential Pressure with Diagbox.

Thanks for the info.

It seems that regen, from your reply, is based on mileage and not differential pressure (DP) across the DPF.

Does Diagbox give the DP value by the way? I would be interested to know that as I am thinking of purchasing same software.

Testing of the cooling fan would be an asset, as I had a severe overheat on my 307 due to fan relay failure. Did not know it was faulty until after the event. I was in a massive uphill traffic jam in summer.

This oveheat caused the cylinder head to warp with attending loss of coolant some months later, just fitted a second hand engine.
 

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Thinking about it Diagbox is unlikely to give DP values as the sensor lines from the DPF connect to only a switch I believe, not a pressure sensor - I believe?? Can anyone confirm please it is a switch and not a sensor and the also what Diagbox actually shows regarding DP across the DPF?

Thanks
 

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Discussion Starter #8 (Edited)
Thinking about it Diagbox is unlikely to give DP values as the sensor lines from the DPF connect to only a switch I believe, not a pressure sensor - I believe?? Can anyone confirm please it is a switch and not a sensor and the also what Diagbox actually shows regarding DP across the DPF?

Thanks
I'll need to check but iirc it has an inlet and outlet pressure sensoreither side of the DPF so I assume that would give correct values. I didn't know I had a slow fan speed error either till I was looking around in Diagbox. I can check all actuators and manually start the fan in both modes in the software but only the high speed works, I know the fan works in normal operation at high speed but neither in normal op' or forced op' can I get the low speed to work. As the car is driving fine I had no reason to think there was an issue. unfortunately a forced regen has specific conditions that it needs to meet to allow it to happen so unless I get rid of the error I can't do a forced regen, No errors is one of the specific conditions.
 

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warning light ' warning risk of filter blocking'

I have recently had this problem...

My car has developed a problem today whilst out.. the triangle exclamation mark warning on the dash along with a warning on the screen ' info warning risk of filter blocking i was in Andover at the time and not sure if ok to drive. Halfords reccomended i get a diesel fuel cleaner thinking it was the fuel filter. I got this and put it a full tank of diesel. Called rescue and they advised it was a clogged dirty filter which should be fine to drive back to Southampton.
Have taken to local garage and they did full dpf regen and the warning light is still on. So they have said i need to take to a peugeot garage as they reckon its a software issue..

My quesion is is there anyone with peugeot planet or digi box around SO16 postcode? that can get rid of the warning for me.. and more importantly is it safe to drive in the meantime??

Thanks
any replies welcome...
 

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On the 1.6HDi the warning will come on around 120k even if the DPF is good but never been changed. I took mine off, inspected and refitted it and told the ECU that a new one had been refitted using the replacement parts menu in Diagbox. This was after checking the differential pressure reading was around 4 bar at 2000RPM, further indication that the DPF was fine. The differential pressure is measured by a sensor. Forcing a regen or putting and additive in will not clear the warning if the problem is as above. It's not a software fault but has to be cleared using Diagbox. Also active regens are normally every 300 miles or so under good driving conditions (motorway etc) and will be more.frequent with increased regular journeys.

Can't tell you whether it is safe to drive without a proper diagnostics being done on Planet/Diagbox, as it could be a different issue or an actual clogged DPF (in which case get it sorted ASAP as the back pressure will kill the turbo, male sure you find the root cause).
 

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After fitting a new DPF and repairing the turbo on my 1.6hdi 307 the 'Risk of DPF blockage' is still annuniciated on start-up. A fellow member did a Planet 2000 diagnostic on the car which revealed coolant fan problems (the fan will only run when aircon switched on, it does not run on low or high speed via the actuator menu).

Can anyone help me with a circuit diag for my car, which being a facelift model is not covered electrically very well in the Haynes Manual?

I need to get the fan system working as it was not possible to do forced regen and more worringly the the car will probably not do a regen automatically.

Only a good spell on a motorway seems to be my current option to clean the DPF. If anyone can help with details of the fan control system on my facelift 307 I would be very very appreciative?!
 

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Hi
I'm having the above issue on my 2013 308, the warning light is On for FAP filter change (according to be mechanic) but he advisesI need eolys top up. I want to steer away from gessing or unnecessarily spending money I don't have at the dealer. So, I'm looking for a member with Diagbox who can help fully diagnose the issue ( London Croydon/SE25) or direct me to the best place to get the latest genuine Diagbox kit please.
Thanks in advance.
 

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I had to do this recently on a 2011 citroen it needed fluid and resetting that was no problem but finding where to lie to it it has a new DPF was a challenge i found it eventually hidden in another menu away from the engine 1 and once i told it lies it was happy :)

The car has done thousands of miles since with no issues and is regenning regularly

Basically you NEED to tell it it has a new DPF at the same time as filling the fluid if you do that the warning will stay away if you ONLY fill the fluid or ONLY clean/replace the DPF the warning will continue.
 

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The DPF sensor is what it says on the tin. it measures pressure drop across the DPF matrix and uses that to give the risk of particulate filter blocking warning and monitor regen requirements. Thats also one of the reasons you need a remap if you remove the DPF as there is no pressure drop in the matrix triggering a fault.

Based on my playing around with various ECU's they do log mileage etc between regens and total distance since DPF was fitted to trigger replacement messages etc.

As Reliable says the DPF could still be fine so just telling it it has a replacement filter fitted (i normally tell it it has about 40K miles where it has the option to be 100%) can clear the codes if the sensor shows the filter is not blocked.

On most models in the maintenance option of Diagbox there is a option for fluid refill and DPF replacement. Other than that it can sometimes be found under exhaust section of engine ecu options
 

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Thank you for the helpful responses, guys!
Any tips/link on where I can get a genuine Diagbox kit without breaking the bank? There's a lot of offers out there which is good and confusing at the same time :)
 
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