ok FIRST thing is a code explanation
the P0455 is evaporative system LARGE leak this can be anything that prevents the fuel system (gas cap fuel filler vapor hose fuel tank etc) from being sealed and allowing the fuel vapors to vent to the atmosphere, this will require a smoke test and some time to properly diagnose, it can be electrical OR mechanical.
the p0442 is evaporative system MEDIUM LEAK and is the same time procedure as the P0455 to find this code often sets before the first code.
P0700 means there is a code in the TRANSMISSION computer and you will need a code reader that can access the transmission computer to get those codes.
P0731 is INCORRECT GEAR RATIO in first gear this can be a ton of things including BUT NOT ALWAYS a bad sensor on the transmission BUT is more often an internal problem with the transmission it means the trans computer detected a slipping clutch pack in FIRST gear the computer expects a certain input and output sensor speed difference in each gear and if it is not in the range the computer is expecting it sets a fault for incorrect gear ratio, you MAY be looking at a transmission overhaul, BUT a good transmission tech will be able to tell NOT a chain shop they are usually looking to lighten your wallet BUT be aware you MAY have internal transmission problems
P0732 is exactly the same as the P0731 except the trans computer detected the slippage in SECOND gear
P0846 is 2-4 or 2C Pressure Switch Rationality, possible causes here are,Pressure Switch harness is open or shorted
- 2/4 Pressure Switch circuit poor electrical connection
- Faulty 2/4 Pressure Switch
- Internal transmission damage
- Faulty Powertrain Control Module (PCM)
- Faulty Transmission Control Module (TCM)
cost to repair these will depend on the labor rate in your area but expect to pay 2 to 3 hours labor for a proper diagnosis, IF you need a transmission or overhaul that's about 2500.00 the evaporative leaks can run the gamut and there is NO way to tell without finding the leak FIRST