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YES!!, you had it tuned, it runs good, but gas mileage dropped, and check engine light is on,it sounds like the o2 sensors are slow or even dead, i would replace them for sure and that just might solve all your problems,good luck, hope this helps.
It's something you can with simple tools, you have four O2 sensors. Your going to have to get the truck rescanned or if you have the DTC code, you can find out which O2 sensor has gone bad so you can replace it. Your going to have Two upstream O2 sensors on each exhaust bank, one O2 sensor before the Catalytic Converter, and the last one after the Catalytic Converter. Its like replacing a Spark plug and you can pick up the O2 sensor at any large Auto Parts store with a can of WD 40. Just unclip the wire leads to the O2 sensor and then with a O2 sensor socket or hint close end wrench and hammer, you can remove the O2 sensor from the exhaust pipe. Good luck and be safe.
i would replace sensors and then reset check engine light and drive if light comes back on then replace converter, 80% of the converters are condemed because o2 sensors are bad,garage fiqure if they replace everything there sure to fix the problem,but the cost is on you.GOOD LUCK!!!!
If he used a "universal" O2 sensor, you could have a wiring problem. I had the exact same behavior on a Mazda MPV. The universal O2 sensors have to be crimped to the old sensor connector, which can cause problems. You can check the wiring closely, or insist that he use an OEM sensor, which will have the proper connector attached.
Just had BOTH of my O2 sensors replaced in my 2002 Miata. The sensors are located
1. at the back of the engine compartment look down (on the passenger side ) You should see a spark plug looking device near the bottom of the engine (on the side) it has a short wire output that goes to a connector looking device on the other end. This O2 sensor had a short wire connector on the other end
Probably can be replaced from the top.
2. This one is tougher --- From underneath the vehicle just after the catalytic converter you should be able to see the Spark plug like O2 sensor . The person who repaired it for me had to trace the wire from the O2 sensor. It goes up into ( perhaps the frame or bottom of the vehicle INTO the Driver compartment under the drivers seat. It is located near the Center Console right at the carpet seam. It was about in a straight line from the BACK of the Drivers side Car Door. He felt around -- and located the Connector (under the carpet near the center console. . He checked underneath the car to the point where the wire disappeared --to confirm he had the correct wire.
Once he located where the sensor wire led to --He had the old sensor out and wire connector disconnected and a New sensor and the connector installed in about 10 minutes.
The O2 sensor for this one was much longer than the first O2 sensor in the engine compartment
He had to use some sort of standard release spray on the old sensor itself --to remove the old O2 Sensor. Since it is exposed to the elements under the car. Wrench, I think a screwdriver and the spray were all the tools I remember him using.....
The autozone code indicated only the engine compartment sensor was bad.
The repair man told me Both usually go bad at the same time.
I fixed the first one only -- turned out the warning light lit up a day or so later indicating the second O2 Sensor under the vehicle was bad. Fixed that as well -- have had no problems since -- repair was about 4 months ago.....
There should be two O2 sensors. If you look inbetween the engine and radiator following the exhaust manifold down to the exhaust pipe you should run into the 1st O2 sensor, following the pipe down stream under the vehical towards the catalytic converter you should find the second O2 sensor. The 1st O2 should be easy but the 2nd might be difficult depending on your abilities. Coils will depend on 4 or 6 cyls, 1 for each cyl. Repair man, go to, pep boys, napa, auto zone, advanced auto parts to name a few.
It can be hard to say which it is, because either one will trip the the code, but in this case I'd place my bet on it being the O2 sensor because it says "warm up" - the O2 sensor has to be up to temperature (around 900 degrees) to function. The computer watches for the O2 sensor to heat up in a certain amount of time, and if it doesn't get to temperature soon enough, the computer diagnoses a faulty heater for the O2 sensor and trips the code.
For the record, this would be the secondary O2 sensor, the one after the cat. That's the one that is used to determine cat functionality and efficiency. The primary sensor, before the cat, is used to fine-tune the fuel delivery.