AdBlue, def, scr, all confusing and how does it work? if scr is not your strong point. In this video I look at the adblue low efficiency fault code that can crop up often. In this video I cover the most common causes and also feature a car that I fixed that the dealer had fitted a new scr metering valve in the blind hope that it would cure the fault when the answer to the fault was right there in live data all the time. Proof that test plans are pointless garbage and you are much better using the old grey matter to solve the issues.
Thanks to Hank and Steve for lending their voices to this video ;)
As ever like, subscribe and share so I can build this into the best fault finding channel on YT.
#faultfinding #nox #adblue #emissions #mechanic #howto

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Contents:-

00:00 Introduction
00:57 What is SCR? What is NOx?
01:21 What is AdBlue?
02:12 What are the SCR components?
02:58 SCR unit functions
03:38 DDE functions
04:10 The SCR active tank
05:01 The metering valve
05:54 The feed pipe
06:19 NTC temp sender
07:30 NOx sensors
09:00 Under car components layout
09:31 Checking AdBlue mixture with a refractometer
09:44 Common leak points
10:16 Metering valve crystallisation
10:26 Bulging metering valve body, spray pattern, and flow rate
10:50 Diagnosing the NOx concentration and why this may cause fault code for poor quality AdBlue detected
12:44 Swapping the front and rear NOx sensors around
13:17 Replacing the faulty NOx sensor
13:33 Conclusion and fault found

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