ozzieowl said:

It's had a new diesel filter new air filter

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But have you addressed the issue that if generating the MAF low voltage code?

There's no point in changing random stuff that's not relevant to the code, it's a waste of time and money.

If the MAF is saying low voltage, you need to concentrate on why.

Automotive diagnostics needs to follow a mathematical path, or you'll simply waste time and money, changing components that aren't faulty to start with.

The glow plug light doesn't come on

ozzieowl said:

The glow plug light doesn't come on

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From memory, no glow light suggests the glow plugs are faulty.