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Discussion Starter · #1 ·
I have a 20016 zaf tourer c deisil .

got the error reluctant pressure low. P20E8

also gave the car a blast as I thought trying to regen the dpf would help fix this for some odd reason and got clouds of ad blue pee smelling smoke out the back end…

cleard the code which cleared the smoke.. but the fault keeps coming back..

taken to local garage who bench tested the injector and confirmed it is working as per their sap on diagnostic machine.. they also gave it a good clean and the hole into the exhaust a good clean., the fault came back..

what diagnostic tools other than main dealer will pick up the actual fault? Vauxhall extortionate.

I have a good scanner on my iPhone which picks up a lot and I mean a lot .. but what am I looking for ..

please help as this is the wife’s car and we are expecting our 5 child so can’t afford to replace .. she also needs this for work

we are based in tayside Scotland if anyone can point me to a indy garage that could help me
 

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Discussion Starter · #4 ·
When you clear the code how far do you drive before it comes back.
i See there are a few posts in here that refer to this issue … is there a step by step guide on how to diagnose this and what scan tools,work best .. so I don’t go buy a pump for it to only be the injector that’s the fault

where are all the components situated ie the pump.. is it hard to Swap out if needead, could I do it myself ?

is there an option to delete the ad blue… has anyone done it .l pm me if not wanting to discuss openly.


thanks in advance again I see lots of posts but no clear way if diagnosing it.. the mech I took to today said he doesn’t know where to start with it
 

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Just out of interest clear the code then remove the filler cap and road test, wondering if the issue is caused by a vacuum created if the vent in the cap is blocked,..
If you want to go down the delete route, which will be a lot cheaper if the above doesnt work, then this is available for the 1.6, PM me for more details if needed.
 

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Discussion Starter · #6 ·
so remove the add blue filler cap then road test? I’ll do it in the morning and repot back.. cant pm you as says your profile is limited
 

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Discussion Starter · #7 ·
Ok so drove car without adblue filler cap on .. still got the error

also getting P1478 & B259A

no issues with performance
 

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DTC P1478
Particulate Matter Sensor Temperature Circuit High Voltage
The particular matter sensor control unit detects that the voltage of the temperature
signal is greater than 3.0 V for more than 2 s.
DTC B259A 04
Left Cornering Lamp Relay Control Circuit Open
 

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Discussion Starter · #9 ·
Car is at a Bosch specialist garage now .. they have all the stuff Vauxhall have so will see that’s the issues
 

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Discussion Starter · #10 ·
Still not further forward yet !
Codes at the min are

P20E8
P1478
He said it’s the Nox sensor 2 ???

ive had this car 5 years and finished paying it off 2 months ago .. we never had any issues form it in all those years until now !!!

ahhhhhhhhhhhhh
 

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Discussion Starter · #11 ·
Update

car ad blue up,so not working apparently. Does the nox sensors have anything to do with this as I if it’s faulty will it inhibit the pump from working ? Or vise verse ?
 

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Was the Bosch specialist no help then,.... the info below explains what the sensor does and how it reacts with the PM in the system, you really need to have a proper diagnostic done with the help of live data, also need to check the DPF regen frequency and back pressure,.. did the Bosch specialist not cover any of this,...

Are you still getting the pump pressure fault P20E8 with lots of white smoke, what does your tail pipe look like, is it covered in a white crust.



DTC P1477
Particulate Matter Sensor Temperature Circuit Low Voltage

DTC P1478
Particulate Matter Sensor Temperature Circuit High Voltage

Circuit/System Description
The particulate matter (PM) sensor monitors the amount of the particulates (soot) in the diesel exhaust gas exiting the tailpipe. The PM sensor is similar to the heated oxygen sensor with a ceramic element, but also includes an individually calibrated sensor control unit (SCU). The sensing element includes comb-shaped interdigital electrodes (IDE), a heater and a positive temperature coefficient resistor for temperature measurement.

The operation of the PM Sensor is based on the electrical conductivity characteristic of the diesel particulate. As the exhaust gas flows over the sensing element, soot is absorbed in the combs between the electrodes, eventually creating a conductive path. When the path is formed, it generates a current based on the voltage being applied to the element. The measurement process continues until a preset current value is reached. To avoid misleading readings, the sensor performs a regeneration where the soot is cleaned off by heating up the element, before the measurement phase begins. The amount of regenerations is based on vehicle strategy; when the calibrated number of regenerations is reached, the cumulative current readings are used to determine the amount of soot concentration in the exhaust gas which in turn determines the collection efficiency of the diesel particulate filter (DPF).
 

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Discussion Starter · #13 ·
I haven’t had the car since last week tbh .. but his is basically what was explained to me .. double Dutch .. but it wouldn’t stop the dpf regenerating ? ..
 

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Tigra Twintop 1.8 AT Z18XE AF17
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Now I’m not so sure anymore, but to me would make perfect sense.
 

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Discussion Starter · #17 ·
Update!

So I was going to have the ad blue mapped out until my mech spoke to the mapping company he uses who said they can do it but as it is a euro 6 car it “may” fail the emissions on Nox levels …it is a 2016 model …

does myomeres with a car the same age be it insignia, Astra or Zafira know what the deal is with the emissions test and would mapping add blue out fail the emission test.. if you don’t want to post it feel free to pm me ..
thanks
 

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Discussion Starter · #18 ·
On a side note .. I can’t find any success stories on this form for fixing adblue
 
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