I had the codes checked on my 2002 Ford Windstar. The codes pointed to having the Oxygen sensors replaced. I was hoping I could pinpoint the culprit and not have to replace all of them. I have a question if it really seems that all will have to be replaced.
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Re: 2002 Ford Windstar Oxy Sensors
There are issues with upper/lower intake gaskets on this engine. Also make sure you don't have a tube disconnected from the air intake between the air filter box and thottle body. If everything is connected, I would be renewing the upper/lower intake gaskets. This will cause lean codes to be set, and you may have noticed a ratty idle on cold start-up. Hope this helps. Good Luck and please leave rating. Thanks
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Google your codes & then diagnose the system & items related to the codes
Type: OBD Code PO 171 --or whatever the codes are
If you have Oxygen Sensor Codes, it is most likely the upstream sensors have failed, because you did not know they get replaced as preventative maintenance at 100,000 or when they fail, if that is how you take car of your vehicles
Oxygen sensors are located on the exhaust pipe in front and behind the catalytic convertor. There are more than one. If your check engine light is on, the code will tell you which sensor is faulty - I need that code to tell you the exact location.
Also really need to know the engine type to be more specific.
If your heat is not working there is probably a fault in the door mechanism that lets air pass over the heat exchanger under the dash. the switch is most likely at fault.
Yes, you can replace them yourself, it's not easy but you will save yourself so much money if you just take the time. Buy a book from your parts store on how to fix your specific vehicle, some wire cutters/stripper and a set of Oxygen sensor sockets. Before doing the work remove the negative battery cable, after your done simply reconnect the battery cable and your codes should automatically remove themselves if you have solved the problem. Good luck!
you have 3, 2 upstream and one downstream. They have wire harnesses attached to them and they screw into the exhaust system. Ususally two in the exgaust crossover pipe, the other just behind the catalytic converter.