Belt shouldn't cause check engine light. The grrr sound might be the abs system. There is no timing belt, it's a chain.
Go to autozone and have them read the codes. Write them down and post them here. Don't always trust their computer for what the codes mean.
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2006 LR3 HSE
1987 Ex-MOD 90, 2.5NA
2006 LR3 SE
2003 Discovery S
1999 Discovery II, SE7?
1996 Discovery SE7