Adblue tank repair details

[Ceenine]

Thanks Paul, I may not need a diagram now for putting all the parts together. I shall see!
A first class video, however he didn’t explore the pressure sensor failure in any detail, however I will replay just in case I missed it which is entirely possible.
Don

[Trickiedickie]

I was going to create a new thread introducing an alternative repair but I can see people are now referring to the pressure sensor and how one might need to test it. In which case I have decided to post some details here which might help people reading this thread. In many but not all cases this would be a viable repair if the pressure sensor has failed. Replacement with a new or a known good pressure sensor would be a good start.

Surprisingly there is an option to purchase a replacement original type sensor directly from the manufacturer in China but bare in mind delivery will take at least 2 to 4 weeks or more.

It is currently possible to purchase a single item for about £29 incl p&p.

Brand Name FLUHANDY
Part no. HM8500J or HM8500F

https://www.alibaba.com/product-detail/ ... 69608.html

$20.00
Quantity -1+
Shipping
Ocean + Delivery US (Economy)
20 more option(s)
Shipping fee: $16.35 for 1 piece
Estimated delivery by Jan 7
Item subtotal (1 variation 1 item)
$20.00
Shipping total
$16.35
Subtotal
$36.35

Taken from………
https://www.2008ownersclub.co.uk/thread ... sues.4136/
SteveB
I had the same problem on my 2016 Peugeot 2008, BlueHDi. Initially the usual 3 warning lights came. After driving about 50 miles, the UREA light started flashing and the 700 mile restriction came up. I reset the warnings using a cheap 'dongle' from ebay and a phone app, which together cost me less than £10 whilst I dug into the problem. To cut a long story short, I have solved the problem by replacing the URAE pressure sensor with one I bought on Alibaba. It is listed as 'HMSensor Urea Doser Pump Adblue Level Sensor Nox Sensor For Automotive Truck' and the company selling it is 'Jiangmen Ever-Smart Intelligent Control Instrument Co.Ltd'. There minimum order is 10, but they allow you to buy a sample which, with taxes etc. cost me £38. A far cry from the £800 demanded for a new tank unit. My local garage, dropped the tank and checked the output from the sensor for me - it was 0V despite having pump pressure. They also replaced the sensor for me. Be advised, it takes about a month to get the sensor (patience required) but, with the dongle and app, this should not present a problem.

Alibaba review by SteveB:
“I am extremely pleased that this supplier allowed me to buy a sample HMSensor Urea Doser Pump Sensor. I needed it to try and repair the UREA system on my 2016 Peugeot 2008 BlueHDi, which had the dreaded 3 fail lights come up. IT WORKED, and it saved me about £800 because Peugeot (and garages generally) insist you buy a complete UREA tank unit, which, quite frankly is absurd! Thank you. The wait for delivery was expected but well worth it.”

[CitroJim]

Excellent! Thais tread gets more and more valuable all the time! Thanks all

[EvilPanda]

I am looking for some help regarding my Adblue system issues. The vehicle I am trying to fix is Peugeot Boxer Mk3 2019 2.0 day van.
Main issue: "Check AdBlue system" message on dash and check engine light on. No count down. Scanned with Snapon reader and it comes up with:
Engine:
P20E8-21 Pressure of the urea fluid too low
u1118-87 build-in systems interface: absence of communication ( this message appears not every time)

Instrumental Panel:
U0019 CAN LINE
B1016 Third stop ( but it works)

I have removed and cleaned the Adblue injector. not leaking.
The AdBlue tank is full of fluid.
tried to use decrystaliser just in case of blockage, but no luck.

When an issue appears, I can't run actuator tests on any engine components using my scanner. A " no response from module " message appears on the scanner screen.

So, does that mean my Adblue system module is faulty or most likely a broken wire somewhere?

[Mihael_M]

Is this the sensor in the Urea tank that changes with the HM8500J? Does the connector fit?

[Trickiedickie]

Is this the sensor in the Urea tank that changes with the HM8500J? Does the connector fit?

No. That is not the sensor. The sensor is shown in the photos I posted previously in my post about buying a sensor from a Chinese supplier.

[Trickiedickie]

I am looking for some help regarding my Adblue system issues. The vehicle I am trying to fix is Peugeot Boxer Mk3 2019 2.0 day van.
Main issue: "Check AdBlue system" message on dash and check engine light on. No count down. Scanned with Snapon reader and it comes up with:
Engine:
P20E8-21 Pressure of the urea fluid too low
u1118-87 build-in systems interface: absence of communication ( this message appears not every time)

Instrumental Panel:
U0019 CAN LINE
B1016 Third stop ( but it works)

I have removed and cleaned the Adblue injector. not leaking.
The AdBlue tank is full of fluid.
tried to use decrystaliser just in case of blockage, but no luck.

When an issue appears, I can't run actuator tests on any engine components using my scanner. A " no response from module " message appears on the scanner screen.

So, does that mean my Adblue system module is faulty or most likely a broken wire somewhere?

I'm not sure about a Snapon reader. It might have some limitations. For a PSA vehicle Diagbox should be used for adblue issues.
For example there might be other errors stored in the ecu and it might be your reader doesn't see them. To fix your issue any adblue related errors have to be cleared. With Diagbox you can re-initialise the adblue pump/module as if you were fitting a new replacement. Then see how long it lasts, if at all.
Another thing is I would drain the tank and refill with fresh adblue before re-initialisation.

[Mihael_M]

No. That is not the sensor. The sensor is shown in the photos I posted previously in my post about buying a sensor from a Chinese supplier.

I asked what it looks like and where the original sensor is in the Urea tank. And whether the original connector for connecting the new sensor from a Chinese supplier fits.

[Trickiedickie]

No. That is not the sensor. The sensor is shown in the photos I posted previously in my post about buying a sensor from a Chinese supplier.

I asked what it looks like and where the original sensor is in the Urea tank. And whether the original connector for connecting the new sensor from a Chinese supplier fits.

Yes the original connector will fit the Chinese sensor. They are the same.
Here is the sensor as marked in the photo with the white line also highlighting the red, black and yellow cables:

[Stuart W]

The " no response" message sounds as if you may also have a canbus communication error with the adblue electronics and not just the sensor issue.The sensor only reads and adjusts the pressure that the adblue pump is developing.

[Trickiedickie]

The " no response" message sounds as if you may also have a canbus communication error with the adblue electronics and not just the sensor issue.The sensor only reads and adjusts the pressure that the adblue pump is developing.

I would consider checking the wiring harness from the tank to the loom. In the past this has been a problem for several PSA models and I believe some were subject to a recall to replace it.

[earlsgate]

I am looking for some help regarding my Adblue system issues. The vehicle I am trying to fix is Peugeot Boxer Mk3 2019 2.0 day van.
Main issue: "Check AdBlue system" message on dash and check engine light on. No count down. Scanned with Snapon reader and it comes up with:
Engine:
P20E8-21 Pressure of the urea fluid too low
u1118-87 build-in systems interface: absence of communication ( this message appears not every time)

Instrumental Panel:
U0019 CAN LINE
B1016 Third stop ( but it works)

I have removed and cleaned the Adblue injector. not leaking.
The AdBlue tank is full of fluid.
tried to use decrystaliser just in case of blockage, but no luck.

When an issue appears, I can't run actuator tests on any engine components using my scanner. A " no response from module " message appears on the scanner screen.

So, does that mean my Adblue system module is faulty or most likely a broken wire somewhere?

as already noted you'll be best off getting a diagnosis with the Diagbox set up. for example plenty of these faults have nothing to do with the pump itself but related to other parts and sensors such as the thermistors in the tank

my boxer has the P20e8 code but using Diagbox I noticed a default 0° C urea tank temp reading on the Denox tests. Actuator tests also confirm the heating tests are failing. Temperature, heating and pressure codes are generated by faulty thermistors to the heating circuits within the tank which put the system into a safe mode to protect the pump.

there is a significant recent(24/06/2024), Technical service Bulletin B1KW017XQ0 .this gist of which states:
Check the resistance between the 2 yellow wires on the gray 6-way connector
If the value is less than 2 kOhms: The resistance is not compliant. The thermistor is short-circuited. The urea tank can be repaired
If the value is greater than 2 kOhms: The resistance is compliant. Can't be repaired

a company in France is offering repairs, if the first condition is met, and they give a 2 year warranty on their work.

when removed my tank and took a resistance of 330ohms on the yellow wires I an now confident it can be easily repaired in due course. I don't use the van in sub -11° C so a simple resistor fix is possible as the existing one bus

there plenty of good discussion on the polish site "elektroda.com/rtvforum/topic3827598.html" and O'reilly youtube shows the tank being removed "Peugeot Boxer 2.0 P20E8 The Pressure Of The Urea Fluid Is Too Low" the TSB is eastly googled and translated too. This thread also pushes the debate further

hope that helps

[Trickiedickie]

I stumbled upon this great video which explains how the adblue system works and how one might diagnose faults. It is well worth watching the 30 min show. Such a shame he didn't point out the likely fault with the pressure sensor!!!!
Video by DiagnoseDan

[Paul-R]

*Ahem*

viewtopic.php?p=816626#p816626

[Trickiedickie]

*Ahem*

viewtopic.php?p=816626#p816626

Oooooops.
My bad for re-posting the same video.

So in the video he appeared to get most things right. Diagnostics showed 4 bar pressure but as we know that really means 0 bar. The pump worked with a dc voltage connected and then didn't work when reconnected to the loom and vehicle ignition switched on.

It's a pity he didn't take it further by investigating the pressure sensor.

In order to test a pump with the original faulty sensor I am thinking it might be possible to apply a voltage to the pressure sensor output (yellow wire) in order to mimic a working sensor?
I think maybe 2.6v to 2.8v would be required so maybe a steady 3v would do it?