How do i cheak for codes

i wouid start with changing the oil and filter on the transmission and take it from there .

sounds like cylinder head gasket cheak oil filler is there a white gunky paste there also cheake radiator filler cap for same thing if so its a oil and water mix head gasket need doing

oil pres should rise as the engine goes faster, the faster it goes the faster oil pump pumps oil pres should also be higher when oil is cold ( oil is thicker) as far as # 2 cyl miss fire cheak spark plug is good 2 start. mybe coil wire. cheak it with ohm meter. is check engine light on ? might have to get it scaned

this can be many things. Have a code check using obd 1 testing.

cHEAK ALL THE FUSES FOR THE CAR THE CIG LIGHTER , RADIO BODY AND DO THE DASH LIGHTS WORK AND OTHER CAR THINGS WORK RIGHT. THEN THATS GOOD CHEACK THE WRES CONNECTED TO THE RADIO MANY INSTALLERS USE POOR TECHNIQUES TO CONNECT THE WIRES TWISH TOGETHER AND TAPE! Soldered connections that are shrink wrapped and carefully routed and tied off work good and look like the manufactor of the car did it the power or ground wires way have disconnected cheak them as most aftermarket radios tell whitch wires are to be power and what kind ( key on, Battery, dash liughts,) and the ground. If these all test good then the radio mayhave blown it's fuse. ( a speaker wire could be crossed) if all appears good even though you gave good money for the radio their not worth fixing them for internal damage and it's timefor anew one

O/2 sensers can cause this problem but don't have to be it. O/2 sensers look like a spark plug and screw into the exhaust pipe near where it hooks to the exhaust manifold. Using alot offuel can be high fuel pressure vacume leak (intake manifolds happen alot on these) and the cheak engine light code can be fond by turning the key from off to on and back three times leaving the key on the third time. The cheack engine light will flash out the codes 12 is start and 55 is the computer completed the code read test. Some models also tell the code and the basic discription on the odometer readout. With the code known follow code dianostics, and find the problem. Many auto parts stores will read the codes for you at no charg and give you a list of possible solutions. A vacume leak and the oxagen senser being bad look the same so don't jump to conclusions as the parts store is in bissness to sell parts not fix cars.

check to see if you put the right spark plugs in the engine (heat range ect) and make sure the spark plug wire boots are seated all the way

Sounds like a blown fuse as the lighter fuse to the parking light fuse to radio fuses can all show this problem. Cheack all the fuses as the altenator won't be charging with some cars that do this. The best way to cheak fuses are to use a test light as a fuse can look look and be electrically bad

You are going to have to check the codes.Then we will know what the engine is asking for.
A code reader can be bought at Canadian Tire for $30 to $40.

It could be your head gasket.