Need help bad... code b2477 and b1881

[trannyfreak]

Hi all, i had a mates friend come and have a go at removing tachograph from my mk7 2008 transit minibus, he said he might be able to get mileage showing on the dash as the tachograph is completely dead, he couldn't do it and now my air bag light is on and I got some codes popping up, whats tge idiot done wrong and its due to go for mot soon, many thanks