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Water and electrnics don't mix well. Its possible that you have just got water in some plugs or sensors, this is more prone if pressure cleaning. If not dried out it can lead to corrosion and further problems down the track. You need to check all connections for water penetration and dry it out. That is the best place to start.

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Q: Why after washing the engine in a 1990 Chevrolet truck the service engine soon light comes on?
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