Q: So, will it prevent the engine starting?

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Truck will not start. It turns over great. I checked the codes and there were 2. P1404. ERG and P1345 crankshaft position sensor. Will either of these prevent the truck from starting. Thank you, Rick

My car has 260000 miles.

EGR valve issues can cause the engine not to start. It is also possible that the crankshaft position sensor can cause the vehicle not to start. I would recommend having these two sensors inspected by a qualified professional to determine if they are functioning properly.

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