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AYC/ACD code 81 + all acd lights on, mysterious code? +anti lock light on fix?

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Old May 21, 2026 | 06:51 PM
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AYC/ACD code 81 + all acd lights on, mysterious code? +anti lock light on fix?

Hello all, I have been driving my Evo 8 and since purchase all of the acd lights were on, tarmac, snow, etc. I went to Midas to have the codes scanned and resulted in the following codes:

AYC/ACD code 81: Pump Relay

ABS-Anti-lock Braking System: P2852: ID:0X00002852 not defined!

ABS-Anti-lock Braking System: 21 FR Snsr

As I was browsing forums and the scanner , I understand it’s from the relay failing but I’m having trouble locating the relay or understanding if it could be something else. Most posts on the forum mention code 82 which is the pump being completely dead which is not on my Evo.

Im hoping for any advice on where to start and where to locate this relay/ part number.

I will also be replacing the front right speed sensor to get rid of the anti lock code 21 but I am still unsure what that P2852 code is, maybe from the sensor failing?

thank you!

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