Correct DPF Pressure Sensor for Audi A5 CNHA - Confl

[Cojo]

Hi everyone,
I’m hoping someone here might be able to help me figure out the correct DPF pressure sensor for my car. There seems to be a lot of conflicting information out there.

Car details:

• Model: Audi A5 Sportback
• Year: 2016
• Engine code: CNHA-PVM
• VIN: WAUZZZ8T1GA054215

Background:

The car has had a DPF issue before. In 2021, the previous owner had the DPF pressure sensor replaced and a forced regeneration done. The part installed at that time was 03L 906 051 B.

Now, in 2025, I’m getting the same DPF error again (P2002 - Particulate trap bank 1 efficiency below threshold).

I started looking for a replacement sensor and here’s what I found:

 

• PartsHaus.co.uk recommends: 04L 906 051 C or 04L 906 051 K
• Caffyns Audi (UK dealership) recommends: 03L 906 051 D
• The current sensor fitted: 03L 906 051 B

As far as I understand, the CNHA engine is part of the EA288 platform and might not be fully compatible with the older “B” sensor. But I’m struggling to understand:

• Why are multiple different part numbers being recommended for the same engine?
• Which sensor is actually the correct one for the CNHA engine and why?
• Could using the wrong sensor affect DPF performance or trigger false regeneration cycles/errors (like P2002)?

If anyone has dealt with this or knows how to verify definitively based on the VIN or engine code, I would really appreciate your help.

Thanks in advance for your time!

Marian