codes 1281,300,301,302 and 0138
codes on odometer are 1281,0300,0301,0302 and 1281. please help.
P1238 is engine coolant temperature is too low. Most likely a stuck open thermostat. Codes P0300, P0301, and P0302 are misfire codes. Random/ multi-cylinder misfire, misfire cylinder number 1, and misfire cylinder number 2. Code P0138 is high voltage at the upstream oxygen sensor. I'd start by replacing the thermostat with a correct 195°F one and a complete tune up. If your Ram has over 100,000 miles on it you're overdue for a tune up. Then clear the computer and see if the oxygen sensor code pops up again (P0138). HTH. -Jim
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