P220E fault after broken Adblue injector cable

[FordBenimar]

Hi All,

The car is Ford Transit 2019, 2.0 EcoBlue 130hp. I have a problem with Check Engine light which I inherited from the previous owner. When scanned with ODB scanner it shows P220E which is related to the Adblue system.

When I brought the car home I noticed the cables to the Adblue injector were cut by a rodent (probably marten). I fixed that checked the resistance of the coil which came up around 15ohm, checked the nearby temperature sensor for the exhaust gas temp. that is ok.

I cleared the fault in a workshop when the engine was hot, and could drive 20+ km without Engine Check light coming up. The next day when the engine started warming up that light came on again, went to the workshop the same fault.

I don't know for how long the car was drive with the injector cables cut off, I assume that was the only problem that caused P220E at the first place. Can I count the fault will go away when next Adblue cycle is completed? By the way how often Adblue is added (all sources only tell for how many km the tank last, but don't really tell the frequency)?

[metalworker0]

i don't know, just searched and found this info telling you to perform extra steps as well as resenting the fault codes ..give it a try no harm done.


Disconnect the Battery

To reset the NOx sensor, you can start by disconnecting the vehicle's battery. This will clear the power to the sensor and reset the engine control unit (ECU). It's important to disconnect both the positive and negative terminals and wait for about 15 minutes before reattaching them. This should reset the ECU and, in turn, the NOx sensor.

from here:

https://www.nevsemi.com/blog/how-to-reset-a-nox-sensor


all the best.mark

[FordBenimar]

Mark, thank you for your answer. I did my research too and already found that article. Can anyone confirm if it's actually needed to removed both terminals and for whole 15 min? I did similar procedure with one terminal (-) and for about 2 min.

Going back to my original post, I think what happed in the meantime when the injector cable was broken the NOx sensor failed, but I'm not sure how to diagnose it. These are apparently prone to failing with no good reason. I check the sensor itself - took it out. Quick wipe and it looks like new. Checked the connector, look good, no moist.

On on the road now (Benimar is motorhome build on Ford Transit base), but my next step would be to get a used NOx sensor and try to swap it with mine, check if it helps. DPF filter seem to work, as the exhaust pipe is free of soot.

Can anyone tell me, of those who really understand how SCR work, what can happen to the system without urea addition?

[metalworker0]

The process of removing the cables discharges capacitors in the electronics , some of these caps take a while to run down , no one seems to know the exact time ,..some suggest after disconnecting you touch both positive and negative leads together, some say turn on headlights after disconnect .some say 15 mins, some say 30 mins.

what google AI shows


Discharging the capacitors in a car's electronic control unit (ECU) can be done to reset its memory and clear fault codes, or to reset other systems like windows or radio settings. This involves disconnecting the battery and then touching the battery terminals together to drain any residual charge.
How to Discharge a Capacitor (with Pictures) - wikiHow.


Here's a more detailed explanation:

1. Disconnecting the Battery:
First, disconnect the negative (ground) cable from the battery terminal, followed by the positive cable.
Cover the battery terminals to prevent accidental contact.

2. Discharging the Capacitors:
To discharge the capacitors, touch the positive and negative battery terminals together with a jumper wire or a screwdriver (with insulated handle).
Hold the terminals together for about 10 seconds to ensure the capacitors are fully discharged.

3. Reassembling:
Reverse the process to reassemble the battery cables, ensuring they are securely connected.

Consequences of Discharging:
Discharging the capacitors can clear fault codes stored in the ECU's memory.
It may also reset other systems, such as the radio's time and date, window settings, or radio stations.
The engine may need to relearn its adaptive values, potentially causing a temporary rough idle or stalling until the system stabilizes.
Most vehicles will automatically relearn these values, but it may be necessary to drive the vehicle for a period to complete the process.