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300K miles on a XC70 is commendable!
By now, you've probably had cylinder misfires and replaced ignition coils, associated ignition wiring damaged by heat, and re-pinned and/or replaced coil receptacle plugs.
Other electronic or related items I've replaced on our 294K 2000 V70 SE:
- Voltage regulator (still have original alternator)
- AC compressor clutch (still have original compressor)
- Steering wheel ignition lock assembly (new lock assembly from Volvo using original keys)
- ABS rear wheel sensors
- ABS control unit
- Turn Signal / Cruise Control switch stalk
I've wondered about the life of original starter, still going strong. I've looked at starter replacements but they're all rebuilt units, including from Volvo. But this has to be a preventative maintenance consideration, just don't know exactly when. Likewise, the in-tank fuel pump life is to be considered.
Have also repaired/spliced all tailgate wiring. Rear wiper motor and rear window defroster are OK.
Engine Control Module? I occasionally remove it and use spray contact cleaner on the pins, then reseat. No problems so far.
BTW, I know the AW-55 SN 5-speed transmission has electrically-operated solenoid valves. Changing ATF at regular 50K intervals keeps those solenoid valves operating OK.
Each car will be different, but above is what I've experienced.
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