#SCR
5 posts in Car Diagnostics blog about "SCR" — OBD-II diagnostics, DTC codes, repair. ← All posts
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P204F: reductant system performance and the AdBlue you cannot ignore
The dosing system is not delivering what it should. Crystallised urea is the usual reason, and short journeys are the usual reason for that.
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P20EE: SCR NOx catalyst efficiency below threshold
The SCR system is not converting enough NOx. That has several possible causes, and only one of them is the catalyst itself.
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P2200 to P2204: NOx sensor circuit on a modern diesel
The most expensive sensor on a modern diesel, and the one that stops AdBlue dosing when it fails. Neither of those facts is obvious from the code.
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AdBlue warning countdown: what happens when it reaches zero
The countdown is not a suggestion. At zero the engine will not restart, and that behaviour is written into emissions regulation rather than chosen by the manufacturer.
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AdBlue and SCR System OBD-II Diagnostics: P20EE, P229F, P2BAD on Euro 6 Diesels
Common OBD-II fault codes for AdBlue/SCR systems on Euro 6 diesels: P20EE NOx catalyst efficiency, P229F DEF quality, P2BAD urea concentration — causes, Live Data, solutions.