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How do you replace the O2 sensor in a 1994 Aerostar XL 3.0 liter?
Wiki User
∙ 16y ago
It is easier to jack up the vehicle & place on axle stands to improve ground clearance. Locate the sensor & unplug the electrical wire, & liberally spray the threads of the O2 sensor several times with penetrating oil to overcome the effects of corrosion. Wait for 30 mins or so for the oil to work, repeat 1-2 times more. Get a good 22mm combination wrench & use steady force possibly with a short pipe extension (no longer than 12"). If that does not work try "shocking" the wrench with a soft faced hammer or mallet , copper is best for this. If still no joy, use heat from a propane torch, this almost always works but beware of a possible fire hazard as there are fuel lines under the vehicle which MUST NOT be affected by the heat of the torch! Use a plumbers fire shield for added safety.
Installing the new sensor is a lot easier than removal. Put a slight amount of antisieze on the threads, not onto the sensor head. Carefully start the new sensor into the "Y' pipe, being careful not to cross thread the sensor. Firmly tighten the sensor & re-install the electrical wire , making certain the wire cannot contact any part of the exhaust system or chaff on the engine anywhere.
Congratulations! you have now installed a new O2 sensor, hopefully engine performance & fuel economy will be improved, Well done !
Wiki User
∙ 16y ago
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