The TP sensor would certainly give you shifting problems. I was going to say check the connections, but you've already done that. It is as easy as it looks to replace.

The exhaust solenoid valve is part of the rear level control system. That's a current code? I'm not sure if that valve is replaceable separately from the entire level compressor. But I would do more checking before replacing anything. You'd need the DTC troubleshooting info to find out what conditions set that code, and then check the circuit itself before replacing parts.

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