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What you have circled are the connectors for the fuel injectors (and obviously the fuel injectors are underneath of them). They have seals which protect from moisture, dirt, and debris, so in most cases there's no chance of misfire due to them getting wet. IOW: The "wet" stays on the outside of the connection. There'd have to be serious ...


1

Yes, there are two radiators. The first one closest to the front of the vehicle so it gets the coolest air is the air-to-air intercooler to reduce the tempersture of the compressed air from the turbo going to the engine. Second will be the air-to-water radiator to keep the engine coolant cool. The can also be the AC condenser which is usually first on many ...


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The fact that the oxygen sensors are reading low at idle, but the reading increases when the revs are increased, would indicate a small air leak that becomes less significant as the throttle is opened. This is also backed up by the error only appearing at idle and not while driving. Air leaks can be fairly well hidden, there could be an air leak for example ...


1

Are you actually having a misfire? If so, then assuming the car was otherwise properly maintained, the most likely culprit on these engines would be a failed ignition module. Those are under the plastic cover that has the "VOLVO" brand on it and is visible in the photograph you provided. Injectors are passive, low impedance components, and moisture ...


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