Mercedes Atego 815 MR Fault

UK PROFESSIONAL DRIVERS FORUMS OWNER AND FLEET OPERATORS FORUM (INTERACTIVE)
1

Can anyone tell me what MR0404 error code means?

Thanks

2

MR are engine fault codes and I think 0404 is weak/intermittent signal from crank position sensor.Pull it out and give it a clean,they get coverd in swarf from ring gear wear which Merc are prone to.