I just bought a 2003 accord EX-L 2d 4cyl 5-speed (256K miles) with some modifications that I'm not fully aware of.

I've noticed modified:

• exhaust (loud)
• shifter (the lever rotates and can twist up the shift boot)
• throttle body looks newer than the rest of the engine
• air intake
• lower RPMs throttling I hear a high pitch whistling (maybe exhaust crackles too coming off throttle) that suggest some forced induction but I don't see any obvious turbo
• aftermarket head unit below the OEM console
• loose wiring in the trunk (red/blue thick gauge w/ 2 separate RCA connectors) I see the thick gauge wires coming out behind the clutch pedal into the siding so maybe there was an amp

There aren't any major problems I've had driving, but the minor issues are:

• Third gear is a little creaky to get into
• Steering wobble (checked power steering fluid and there's only a little bit in it) and turning is pretty stiff
• braking hard while going above 40mph while in neutral caused a hard steering shake
• braking coming to a stop sometimes feels like the brakes coming on and off wobbling the car faster/slower
• low beams seem dim
• passenger window doesn't roll down smoothly
• air bag light comes on according to a mechanic means they need to be replaced

With the background established, my main concerns are both doors' power lock switches aren't working, and the key fob unlock/lock buttons don't work. When I press either door's lock/unlock switch I do hear a clicking noise behind the driver side dash, but not when I use the fob. I confirmed the car does receive the fob because I can hold the unlock and both windows will roll down (also both doors' power window switches work), the trunk button works, and I see a red light flash once on the fob when I hit the lock button. I checked the relevant fuses in the driver well for the locks (good). I'm getting a P0685 ECM/PCM internal circuit malfunction power control circuit as well as cat converter code (mechanic says needs a new cat.)

Update: I fixed the power locks by replacing both doors' lock actuators. I just have the 2 codes to deal with, but no rush because no driving issues.