Q: Engine emissions light

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Vauxhall astra 55 plate 1.4. Car has service mot.. 2 days later car breakdown, garage says head gasket. Had that replaced, secondary exhaust gasket replaced, sump gasket replaced and a few other things. 3 days later again car breaks down. Explain all to recovery mechanic driver and he says it sounds like egr valve which would be connected to the gasket. Should this of been looked at when replacing the head gasket... Am I being ripped off by the garage.

My car has 99700 miles.
My car has a manual transmission.

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