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Fault Code: Knock sensor 1, circuit A, short circuit to ground

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salamonnandor:
Hello Everyone!

So I boght an 2023 F850GS ADV. I rolled out off BMW and after 100 km I got a 0x3A1B81 fault code it's a Knock sensore problem.
I go back the shop and they search the bike for problem. The cables are fine, the sensore had replaced. I was happy... for 100 km. The problem came back. They sad I have to wait for the new software and I should live with it. I'm now a little fustrated. It's a new bike.. Anyone have a toughts what shod be the problem, or what should I check? I don't want to damage the bike!

Thanks!
Nandi

WayneC:
Interesting to say the least, it would be worth posting an autoscan

Short to earth suggests knock sensor is lower in impedance than the firmware expects hence the error

I would be tempted to hand the bike back to the dealer & lodge a complaint with BMW

Jughead:
Yes, take the bike back and make it their problem.

I would insist on either another new bike completely or a full refund.  If the bike is financed, lodge a complaint with the finance house if the don't come to the party.

salamonnandor:
So yes I send it back to solve the problem. I will post the result.

Mikasa:

--- Quote from: salamonnandor on April 22, 2023, 07:17:21 PM ---Hello Everyone!

So I boght an 2023 F850GS ADV. I rolled out off BMW and after 100 km I got a 0x3A1B81 fault code it's a Knock sensore problem.
I go back the shop and they search the bike for problem. The cables are fine, the sensore had replaced. I was happy... for 100 km. The problem came back. They sad I have to wait for the new fnf software and I should live with it. I'm now a little fustrated. It's a new bike.. Anyone have a toughts what shod be the problem, or what should I check? I don't want to damage the bike!

Thanks!
Nandi

--- End quote ---
I think you have encountered a problem with the knock sensor. In addition to the sensor and cables, it might be worth checking the engine control unit (ECU) and related wiring to ensure there are no issues impacting the knock sensor's functionality.

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