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2001 Volvo S40 Questions

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SOMETHING DRAINS MY BATTERY- 8 AMPS. TOOK OUT the TCM FUSE. FIXED THE CURRENT DRAIN!!!!!!!!! NOW WHERE IS MY TCM LOCATED?
What seems to make the problem better or worse? NOTHING
How long have you had this problem? A FEW WEEKS
Have done everything to appease this code...even replaced the newly replaced Bosch 02 sensor with the Volvo preferred 02 sensor and still the light comes on. Can't smog it so can't complete the registration...have put too much money in out and now I NEED to know what the problem is!!! HELP
Engine codes p0234 p0243 Will not idle
engine won't idle
After towing, fixed cut timing belt and replacement of 2 bad nozzles, the engine doesn't start nor the plug shocks.
Gave up o replacing sensors .light comes on after 20 mi Went to dealer they said no recall is opened.It did not have a extra harness but I thought it could have been taken out , last owner does not remember. Dealer did not mention a reset or software upgrade . Where do I go to find out if this car needs updated software or to be reset after a new sensor is put in ? What will disconnecting the battery for 8 hrs do?Exhausted in Oceanside ca
I checked the spark plugs they were very dirty I replaced um an replaced my coils as well still no start I well did a full oil change an there was no milky substance so I'm thinking my head gasket is fine.
The car has sat up for about 2 years before I bought it and I had to replace the timing belt bracket but it still runs rough when first started and has trouble getting up to speed when I take off or slow down
I replaced radiator myself and did not measure how much fluid I lost when trans. hoses were disconnected.
Been noticing a rattling noise the car is idling in park it's fine
Shift into reverse it rattles for a second
Neutral is fine
Drive it rattles 3 times
And when accelerating past 20 or 30 it rattles for a second as well feels like it's on the left.

Joints maybe or mounts my drive in Houston always has a ton of bumps and it rattles when I go over those as well.
01 s40
173k
Had battery tested and fully charged at autozone
Then figured it was that alternator
Had that and the serp belt replaced.
Ran fine for a week then I had the door open for maybe 10 mins (car off light on) and then it wouldn't start.
Jumped it and took a drive for 30 mins to see if it would charge up, and wouldn't start again.

Thinking there's a power drain from a light or something any clues on common issues or where to start looking?
We're reading code P0237 on our Volvo. We replace the boost sensor and reset the check engine light. Light hasn't come back but the code is still popping up. Can't pass the emissions check with the code. Any ideas on what to check next?
and right now my right tire is hanging onto two good studs I can't move my car at all I was driving and I heard rattling or knocking in that same tire and the two studs broke
they were working but i crossed a wire and it sparked. it blew the courtesy light fuse when it happened so I replaced that and everything else seems to work except license plate lights and I cant find a fuse for them
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