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The battery acts not only as a power source, but also as a stabiliser. When removed the alternator has nowhere to send the majority of the output and I would suspect the ECU shuts things down before expensive bits on the wiring loom get damaged through overvoltage.

Then it could be advanced wear anywhere inside. You might find changing the oil again is the cheapest way of improving things, or not (£50). It will also give you a clue there are other issues if more sludge comes out.

Mileage. Service history How many previous owners ?

14.8V may be a bit high if the alternator is doing all work in the car, do you have a calibrated voltmeter ?

Find/borrow a known working battery.

There are two chains in the engine, other members/threads have suggested changing both together.

Is the engine making noises ? Do you have service history ? Are you a new Honda owner ?

Keep the engine cover off and pour some water into the groove where the injectors sit before a long drive, it will show which injector seal is blowing mine has been 4 and 3. Since you have cleaned out much of the deposits upstream, the freed off turbo vanes will be working at a higher...

With the tailgate upholtery removed, you could check the connecti ng block that goes to the 'boot' button on the right hand side. I did have issues once when trying to shut the door on something that did not fit in the boot. Do you have any indication on the dashboard (red light/tail gate in...

Try it. I have had similar issues, fixed (for now)

A shade under 190000.

I can take a picture of my exhaust if you need. How high a milage is yours ?

If it clears after a few seconds I would suspect crap in the exhaust boxes is being shifted by the engine breathing better. There will be a large amount of black stuff sitting in the back box of a high mileage diesel.

Disconnect the battery for almost an hour. Have you had anything damp in the car lately ?

Codes are on the dashboard lights , no need for HDS. Do you have a tourer ?

Look back to one of my early threads (2016/7), I was able to reset using a shorting pin on the OBD2 port. Once I had replaced the pump, I was able to bleed the system by slightly undoing each of the unions on the top. There was no need to go all the way to the brakes, though if you have the...

For those that were curious (F4had)

If it is anything like mine (before the clutch slip got terminal) here is a grinding noise which best guess is a worn drive shaft as it enters the gearbox. I may be able to take pictures next week during the dismantle.

Service the stuff under the bonnet first, corrosion (unless worse than cosmetic) should be second on the list.