Frequent faults of the AdBlue (SCR) system on Mazda vehicles

Mazda AdBlue SCR

Frequent faults happen to the AdBlue (SCR) system on Mazda vehicles.



  • The “Engine Fault” warning lamp turns on


Error Codes:

  • P20B9 – Reductant Heater A Control Circuit Open


All those who have this problem, and want to repair it as soon as possible, can contact us on the number +386 41 652 952 or, by sending an e-mail to, or through the contact form.


Catalogue numbers:

0 928 404 003 0928404003


Mazda AdBlue SCR

Image of the unmounted AdBlue reservoir.


Mazda AdBlue SCR

If the client comes to us with the vehicle, We handle the disassembling, otherwise the

client can disassemble it alone, and send us the module shown in the picture above

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