Hello i got a 1990 dodge daytona shelby the code 13 is MAP sensor signal to the computer (ECU) not changing so the map sensor is should be on the firewall with a vacuum line on it little black box looking thing well make sure it plug in and good and that it dose not have a leaking vacuum line if that dose not work you have a bad map sensor thay run about 30 to 100 at auto zone o onec you think you fix it remove the battery term for about 5 mins with the key on and trun the key off before conttecting the battey back up drive for about 20 mins to see if the code show up if you get code 55 all that means is end of falt code list you mite get a code 12 meaning The battery has been disconnected and the computer (ECU) has been reset hope that help keep that daytona runing it a good car
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