What is the number 12 trouble code on my 95 camry dx 2200 engine

misfire cylinder number 1 need to check wiring coils plug for the number 1 cylinder
https://www.engine-light-help.com/P0301-check-engine-light.html P0301 OBD II Trouble Code Fixing Misfiring Engine P0301

Toyota Camry Cressida OBD Trouble Codes -

www.troublecodes.net/toyota/toyota-camry-cressida/

Get Help at BAT Auto · Get an ALLDATAdiy Repair Info Subscription ... Toyota Camryand Cressida have two separate diagnostic connectors and two separate diagnostic modes which both provide ... 92-95 Camry 2.2L Engine Code: 5S-FE ... 31, Volume air flow (VAF) sensor-Cressida -circuit, Wiring, VAF sensor, ECM.

1.6 GLi COROLLA

DTC NUMBER TROUBLE AREA 12 RPM signal 13 RPM signal 14 IGN signal 16 ECT Signal 21 Oxygen sensor signal 22 Water temperature signal 24 Intake air temperature sensor 25 Air / Fuel ratio lean 31 Vacuum sensor signal 41 Throttle sensor 42 Vehicle speed sensor 43 Starter signal 52 Knock sensor 51 Switch COND

Have a look at this Fixya answer, it may assist

http://www.fixya.com/cars/t4223308-find_vacuum_hose_diagram_1996

You need to scan the computer for trouble codes. If the light was on, there must be codes set. On a '95 Buick, it would be OBD-1, On Board Diagnostics-first generation ('96 and later is all OBD-2).
The diagnostic connectors are different for OBD1 and OBD2, but in '94 and '95, GM was on some models using a "hybrid" diagnostic link connector. You will just have to find the right diagnostic connector to get your codes. The guys at autozone or a national parts store who do engine scans for free may help you figure it out. If it is a straight forward OBD 1 connector, a cheap code reader could scan for trouble codes. For the OBD1, you can also use a jumper wire between terminals
A & B of the diagnostic link connector. Turn key to on, and two digit codes will begin to flash on the check engine light. Code 12, for instance, would be a flash, pause, two short flashes, and longer pause before the next code appears. Code 12 by the way, just means that the computer is in diagnostic mode-after that any set codes will appear or be flashed. Code 55 may also be flashed-this code means the end of codes that are set.

That means trouble with the manifold pressure sensor, which causes trouble with injection and ignition timing. See here p372

http://www.turboninjas.com/camry/eg1.pdf

maybe----go online to magicmechanic in orlando--mail him the issue--is an expert on diagnostix

lift the bonnet and count them
there will be 2 under the engine one at the front and 2 at the top at the ends of a rod

Oil drain plug is on bottom rear of motor passenger side of car.