Hi my car is 1996 mercury mystique and it says on the fuel geage unleaded only and the oxygen senser is not working so at least until i change the oxygen senser if i use super unleaded fuel does it ok ?is there any benefit to the engine that i use the super from the normal fuel ? thankyou
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in line engines will have 2 --one before the cat converter (HO2S) and one after (O2S)
if it is v engine there will be 1 of each in the same positions for each bank
HO2S sensor have 4 wires and O2 sensors have 2 wires and cannot be confused if the ECM is to control the mixture properly
Yes. You can still drive the car without worrying. Your fuel mileage may decrease, and you may begin to smell a unburned fuel (sulphur) smell. Eventually, you will need to have the oxygen sensor replaced or you may cause damage to your catalytic converter.
Check for vacuum leaks.You can spray starting fluid around all parts of the intake.Observe idle as you do.If there is a leak the engine rpm will race higher.Also listen for hissing noise.Is the check engine light on?..If so what codes are stored..Good Luck!!!