1998 ford windstar with a bunch of different codes,they are P1744,P1537,1538,P0401,P0402,P0304. The problem that i'm having is the overdrive light on the shifter lever is starts blinking and then want shift into overdrive. I was wondering if maybe one of these could be causing the rest to show problems.

First check all spark plugs wires and boots the 0304 is a #4 cylinder misfire and if it's a +jumping to - this is affecting the other sensors a bad plug boot should be looked for and also check for cracked spark plugs at #4 cylinder next if you find that there's a leaking +to- antifreeze or oil leaking into that cylinder will cause it also and you have fixed the problem now disconnect the battery cables for 5 minutes and then reconnect them now turn your key to the on position to get the dash lights on but do not start the car and observe the lights if the check engine light goes out and abs and air bag now start the engine this is the self test mode for the obd system if the check engine light stayed on then there's still a bad sensor and read the codes again if your driving and the check engine light comes back on now do the same read the codes for other components that are bad the #4 misfire will definitely throw a bunch of codes because of the + leak to - and the other sensors here will be getting + voltage where there shouldn't be next if your getting the 0401-0402 that's the egr valve saying that it's insufficient first then excessive second the grounding could be frying that egr control solenoid next the 1537 &1538 are the intake manifold runners on both sides bank 1&2 cylinder head sides and could've been caused by the egr codes from the first problem next the 1744 is the torque converter clutch is stuck in the off position this can be also from the first problem but go to the transmission bulk head connector and unplug it and look for a fluid wet plug and connector or water from being loosely connected if water clean with denatured alcohol and let dry both sides bulk head and plug if you find fluid in the bulk head plug/connector you must drop the pan and change the bulk head and again clean the plug and change the transmission switches inside they are damaged from that same jumping off circuits from the fluid leak and also the water leak but maybe not you have to road test the van but I will tell you that the #4 cylinder misfire could be causing all the other codes but I wanted to include everything that's coming up because I am not there to check myself ok good luck Stephen First check all spark plugs wires and boots the 0304 is a #4 cylinder misfire and if it's a +jumping to - this is affecting the other sensors a bad plug boot should be looked for and also check for cracked spark plugs at #4 cylinder next if you find that there's a leaking +to- antifreeze or oil leaking into that cylinder will cause it also and you have fixed the problem now disconnect the battery cables for 5 minutes and then reconnect them now turn your key to the on position to get the dash lights on but do not start the car and observe the lights if the check engine light goes out and abs and air bag now start the engine this is the self test mode for the obd system if the check engine light stayed on then there's still a bad sensor and read the codes again if your driving and the check engine light comes back on now do the same read the codes for other components that are bad the #4 misfire will definitely throw a bunch of codes because of the + leak to - and the other sensors here will be getting + voltage where there shouldn't be next if your getting the 0401-0402 that's the egr valve saying that it's insufficient first then excessive second the grounding could be frying that egr control solenoid next the 1537 &1538 are the intake manifold runners on both sides bank 1&2 cylinder head sides and could've been caused by the egr codes from the first problem next the 1744 is the torque converter clutch is stuck in the off position this can be also from the first problem but go to the transmission bulk head connector and unplug it and look for a fluid wet plug and connector or water from being loosely connected if water clean with denatured alcohol and let dry both sides bulk head and plug if you find fluid in the bulk head plug/connector you must drop the pan and change the bulk head and again clean the plug and change the transmission switches inside they are damaged from that same jumping off circuits from the fluid leak and also the water leak but maybe not you have to road test the van but I will tell you that the #4 cylinder misfire could be causing all the other codes but I wanted to include everything that's coming up because I am not there to check myself ok good luck Stephen