Question about 1998 Saturn SL

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1998 saturn sc2 P0303 code just came up. already

1998 saturn sc2 P0303 code just came up. already changed coolant temp sensor 2 weeks ago to remove another code. just had engine replaced and new plugs and wires. what do i cyheck now for the P0303 code

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P303 is a cylinder 3 missfire I woul first check the coil and then the ingnition module, Then if this dont work you could have a bad injector. If after testing and still no fix you should check the compression in that cyl.

Posted on Jul 09, 2009

  • carl Jul 09, 2009

    Well it was posted that new plugs and wires were installed however it would be a good idea to make sure one of the new plugs was bad or not gapped correctly thats easy enough though just switch plug number 3 with plug 2 see if missfire changes cyl. same with the wires.

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Misfire cylindre number 3,

check spark plug, and wire

check injector if works fine

Posted on Jul 09, 2009

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I have a code p0303 misfire cyl 3 , ford says bad injector. I bought a new one switched it. Still p0303 ,took it back to Ford they still said bad injector. I swaped from cyl 1 to cyl 3 . Still p0303 ,it...


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Comment from the FixYa Moderator Staff:

Regarding your PO0117 code, I would suggest to you to replace the Coolant Temperature Sensor. This is a rather common isue, either the sensor is bad, the wiring connection is compromised, or the coolant level is low. I woul dthink that the senor is the issue, however.

Thnaks or coming to FixYa for advice with your VW.

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First, if you have access to a scan tool, check the reading of the coolant sensor. Does it read a logical number? If so, the problem is likely intermittent. Perform a "wiggle" test by wiggling the connector and harness to the sensor while watching the reading on the scan tool. Watch for any drop-outs. Drop-outs would indicate a bad connection. If the scan tool reads an illogical temperature, check the resistance of the temperature sensor. If it is out of specs, replace it. If it is in specifications, unplug the sensor and, using a fused jumper wire, jumper the two terminals of the connector together. The temperature reading should now be maxed out to above 250 degrees F. If not, there is likely a problem with the ground circuit or voltage supply.
Check for 5 volts reference voltage at the connector. Also check for ground presence at the connector. If you do not have 5V ref. and/or ground continuity, check for these back at the PCM connector. If you have these at the PCM connector, then repair open or short between the PCM and the sensor. If you do not, remove the offending wire from the PCM and then check for proper voltage at the PCM pin. If it's present now, repair short on the circuit. If it isn't present after removing the wire and checking the pin, replace PCM

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1 Answer

On a 93 Saturn SC2, the Coolant light on the dash is blinking while the temp gauge is fine and the overflow tank is full. Where is the sensor for this?


the sensor for the coolant level should be attached right to the overflow tank... there should be a harness with wires coming out of the tank

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How to replace coolant heat sensor on 1998 saturn


the coolant temp sensor is located on the right side of the cyl head its small under by the upper rad hose 13mm socket removes it after u take the small connector of,make sure the car is cold coolant will come out when u remove it,,,,check the connector too for corrosion,by only saturn sensor the cheap autozone and aftermarket ones dont read right and give you the same problem as the old bad one

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i would check the engine coolant sensor or the switch is bad

Jun 12, 2009 | 1993 Saturn SC2

1 Answer

1993 Saturn SC 2 starts but wont stay running


Engine coolant temp sensor, If you pull it you will be able to see if it is cracked.. I don't know why but the original sensors they designed the ceramic tips crack around the tip of the head.. It will make the car nearly impossible to start smoke when cranking the engine, and idle really rough racey infact. 15 dollars or so let me know if that worked for you

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