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Q: Service engine light on 1995 Ford Ranger

Hello My Ford Ranger XL service engine light came on. I had the auto parts put the computer on the car. It showed a code for the oxigen sensors. I replaced the egr valve and the before the catalytic converter. I also replaced the Vacum solenoid and the hose to the egr valve. The service engine light is back again. What can be the problem now? There is another oxigen sensor not yet replaced after the catalitic converter. Can you help?
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The code stored in the computer should identify exactly which oxygen sensor has failed and whether it is a sensor performance issue or heater circuit failure. If you can tell us what the exact code that is stored we can tell you the most likely problem and which and where the sensor is located.
Boy those check engine lights can really be a pain. Sometimes on older vehicles the service light can be related to multiple possibilities with unclear error codes. At my Auto Zone store they were able to take the code reader, plug it into their system and run a printout of a list of items related to that error code. I started with about 5 possible items. For me it ended up being a problem with the vapor evap system (charcoal canister syst. located by fuel tank. (99 explorer)
You may try changing your air filter, as when it restricts the flow of air to the engin, your check engin light will come on. Hope that helps.
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