For the last week I've had the EML come on when starting up the car, when it first came on it went into limp mode but after that it drove fine but still had the light on. I tested it with a cheap reader and that came back with the p0488 code. However I got a second opinion off someone who works at a garage and they used a proper reader and that brought up both of the above. However this is where it gets strange, while his reader was plugged in the car drove perfectly fine with the engine light off, the second he unplugged it the light came straight back on it was like his reader by passed the error. I'm thinking both these codes relate to the Egr valve as it's the diesel, I've looked under the bonnet today and located it but it looks tricky to remove, does anyone have a step by step guide on how to remove it??