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Old 04-07-18, 02:50 PM   #1
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Default P20E8 fault code and urea tank

I am looking for some advice on how to proceed after my local Peugeot dealer investigated the "UREA : Emission fault warning message" and revealed fault code P20E8 00.

They topped up the urea tank (although the dash message still showed more than 1500 miles remaining) and cleared the fault. They said that if the fault message returns I will need a complete new urea tank costing over 1,000 !!

Guess what, 5 miles later the message returned. I went back to the dealer, but no joy. They believe the fault means the pressure of the urea fluid is too low, which means a new complete tank. The car is a Sept 2014 2.0 Bluehdi 150, and so is only a few months out of warranty. It has had all the recalls undertaken including the urea wiring loom.

So, what could be the causes of low pressure. A hole in the tank ? A faulty pump ? A blocked atomiser nozzle ? Are any of these fixable without replacing the entire unit ?

Would any of you know of a specialist who could look at this....other than one of the main dealers ?

Any help and advice would be very welcome. Thanks.
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Old 04-07-18, 05:08 PM   #2
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I had issues with repeated false urea alarms. Was expecting loom replacement etc. but in fact all it required was a new cap to maintain pressure (under warranty - just!). I would make sure the cap has been considered before any major surgery on the system is undertaken, particularly now you are out of warranty

I am sure they said it was a recall item? Or maybe just done under warranty. I didn't take the car in so can't recall, sorry.... Not sure why you dealer not up to speed on this, but TBH nothing surprises me with these guys

Sure a cap couldn't be that expensive (could it? ), got to be worth a punt nonetheless
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Old 04-07-18, 05:13 PM   #3
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Thanks for this. I think the cap has been replaced...but it's a good suggestion to try another.
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Old 04-07-18, 09:39 PM   #4
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The TSB reference for the New cap for Ad Blue filler is HUH. Unsure if that was related to filling level not resetting rather than to tank sealing issue - but worth a shot. Mine's a May 2015 plate so be interested to hear if it gets resolved or I have a potential 1,000 cost looming......
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Old 05-07-18, 10:48 AM   #5
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Yes, got to be worth a punt.

A cap was definitely used to resolve my P20E8 'reductant pressure' fault code, this solution maybe not have been applicable in all cases though.

I am sure the system could be repaired given it's 'relative' simplicity but unfortunately as seen across the board these days given the willful restriction/unavailability of sub-components or repair solutions it is far easier to replace whole items/systems at great cost rather than bother with any of that repair malarkey
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Old 05-07-18, 03:52 PM   #6
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Thanks for your comments.

I have gone to another Peugeot dealer to buy the latest Adblue tank cap (part number 16 319 998 80) which seems to be the cheapest part to replace as a start point. Although it was 19.54!

I have also ordered an OBD2 fault code reader/reset tool, and I will let you know how things go with the new cap when I have erased the codes this weekend.

BTW, I also asked the dealer price for a new tank. They quoted 950 for the part alone + fitting. A quick look on Ebay shows part number 16 101 155 80 as the Adblue tank/pump for 150.

Can anyone confirm that part number as correct ? Also, does anyone know what is involved in replacing the Adblue tank ?

....to be continued
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Old 07-07-18, 09:47 AM   #7
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Fault code erased, new Adblue cap fitted to tank. 3 miles later, the P20E8 fault code pops up again.

The Adblue cap looked identical to the one that was on the car, so I guess the HUH recall (for a new style cap) wasn't necessary on my car.

So, looks like the replacement tank is the only option. I believe the pressure sensor and pump are built into the tank. Can anyone confirm if that is correct ?
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Old 07-07-18, 04:22 PM   #8
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Would forcing a Urea level reset help? If you read the manual it suggests leaving your ignition off for 5 minutes, all doors shut etc, then waiting 10 seconds after turning the key before starting the engine. I believe one of the reasons for replacing the wiring loom was because it was giving false level readings and not fully resetting once topped up.
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Old 07-07-18, 04:53 PM   #9
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Hi Forest37,

Thanks for your suggestion. I did try that but without success. I think the fault code indicates low urea fluid pressure (which I guess could be caused if the tank was empty). However, the dealer did top up the tank and turn off all the warning lights.

Now, each time I turn off the warning code, it reappears after a few miles.

Anyone else with some knowledge of how the tank is removed and replaced?
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Old 07-07-18, 06:00 PM   #10
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Quote:
Originally Posted by MikeKiernan View Post
The car is a Sept 2014 2.0 Bluehdi 150, and so is only a few months out of warranty. It has had all the recalls undertaken including the urea wiring loom.

.
You said a few months out of warranty I make it that's it is almost a year out of warranty.
Had it been just out of warranty I would have been in touch with Peugeot customer service to see what they thought on your situation.
( In my case I'm low mileage at 3 years I will have done 18K miles.)
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