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Why is the check engine light on a 2001 Ford Ranger 4.0 still on after the O2 sensor has been replaced and the system is calling out the same sensor as the problem?
Wiki User
∙ 17y ago
I HAVE THIS SAME PROBLEM AS WE SPEAK. ONE THING U CAN DO REAL CHEAP AND MIGHT HELP IS CHECK YOUR MAF= MASS AIR FLOW SENSOR TO MAKE SURE THE HEATER WIRE IS NOT BROKEN AND CLEAN IT WITH MAF SENSOR CLEANER OR ELECTRIAL CLEANER. CAN GET A CAN FOR LIKE $6.00 MAKE SURE U SPRAY THE HECK OUT OF IT. HOPE THIS HELPS MAN If you reset the light and it came back on it is because the O2 sensor was not the problem. The computer detected a problem with the emissions system, and threw up a fault code. That code indicated that the O2 sensor was being effected by the problem. The code does not mean that the O2 sensor is bad. It just means that it is being effected. It can be many things, that is why it takes skill to diagnose a problem correctly and not just throw parts at it. Take it to a pro before you waste more money on parts you don't need. Now if you didn't reset the light, do so, and see where you stand.
Wiki User
∙ 17y ago
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