Oxygen sensors have been installed into the exhaust systems of vehicles for quite a few years. Depending on the year of your Ford Explorer, you may very well have multiple oxygen sensors. The easy part is telling if one is bad; the hard part is telling which one is bad.VOLVO VIDA DICE These sensors monitor the amount of oxygen to the ratio of fuel burned through the exhaust system,l and if they detect a variation above or below a certain range, the sensor sends out a signal to the computer of the Explorer, which then triggers the MIL (Malfunction Indicator Lamp) to be illuminated on the dashboard while the vehicle is operating.
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Locate the DLC (diagnostic link connector) under the driver's-side dashboard. It will have a trapezoidal shape and resemble the outlet of the code reader plug. Plug the hand-held portable code reader into the DLC once you've located it.

Turn the ignition key two clicks to the "key-on/engine-off" position. This will apply power to the code reader and allow all of the power options of the Explorer to perform without the vehicle actually running.

Locate the buttons and options on the code reader. Many hand-held code readers will have two or three buttons. One will be an "Enter" button and the other one or two will be scroll buttons that will manipulate the cursor to the onscreen menu of the code reader.Vagcom 16.8 Use the scroll button to move up or down to the "Codes detected" or "Read codes" option on the onscreen menu of the code reader. Press the "Enter" button.

Write down the number and the brief description the code reader dictates on the onscreen menu. An example may be "System Lean; Bank One Sensor Two." This would indicate the the mix of oxygen and fuel is too lean and the sensor in the first bank and farthest from the engine has triggered the MIL light to report the problem to you. While this is merely one example of many different DTCs (diagnostic trouble codes) that could trigger an MIL light to illuminate, it does indicate a problem with the oxygen sensor and which one has the problem.
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Locate the bad oxygen sensor by referring to the manual to learn where the first cylinder or "Cylinder One" is located on the motor. Different-sized motors in the Explorers offer a variety of options. The position of the first cylinder dictates which bank the oxygen sensors run and scan.GM Tech 2 It may be the right side or it may be the left side. Some Explorers may have up to four oxygen sensors, and determining the bank is crucial to locate and condemn the problem sensor. The lower the number in the bank position (for example, bank one) the closer to the motor the sensor would be. The higher the number in the bank position (bank two), the farther down the exhaust system and away from the motor it will be.

Introduced in 1958, the Chevrolet Impala is a full-size car manufactured by General Motors.GM Tech2 The Chevrolet Impala can experience problems relating to its security system, called Passlock II, which often can be resolved through some troubleshooting steps.
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Sensor Problems

    The Chevrolet Impala security system relies on a sensor that detects the rotation of the lock cylinder, which can be performed successfully only by the proper key.VOLVO VIDA DICE The sensor can wear out over time and fail to submit a stable signal based on cylinder rotation, resulting in the inability to start the Impala. Replacing the sensor typically resolves the starting issue.

Lock Cylinder Problems

    The lock cylinder in the Chevrolet Impala security system contains a key reader designed to detect the microchip encoded in the key. A worn or defective lock cylinder may fail to read the chip properly and signal the ECU that a non-encoded key has been used. The ECU then disables the engine to prevent theft.Renault CAN Clip Replace the lock cylinder to restore proper security system function.
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Security Light Flickers

    If the security light for your Chevrolet Impala security system flickers on and off, a low-charge battery may be to blame. Check the battery for a secure connection as well as the terminals for corrosion before recharging it. If the battery is beyond its life expectancy or fails to recharge, replace it.

The 2001 Pontiac Grand AM has an onboard diagnostic computer that stores trouble codes when the vehicle is in need of regular maintenance.VOLVO VIDA DICE It also generates and stores codes when there is a problem with the vehicle's emissions control system. This will cause the "check engine" light to come on. At this point, you need to have a diagnostic scan run on your Grand Am. This can be done for free at most auto parts stores. Once you've discovered and fixed the problem, you need to reset the computer.
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Open the hood of your Grand AM.

Loosen the retaining nut on the negative cable clamp connected to the negative battery terminal using a socket wrench.

Slide the cable clamp off of the negative battery terminal.BMW ICOM A3 Pro
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Wait 5 minutes and reconnect the cable clamp to the battery terminal. Then, tighten the retaining nut on the clamp using a socket wrench.

Start the Grand Am and drive it around for 10 minutes.Renault CAN Clip This will allow the computer to cycle and will complete the process required for the computer to reset itself.

The oxygen sensor on your Saturn SL monitors the Saturn's exhaust. It sends information about the pollutants in the exhaust so that the SL's computer, called an ECU, can make adjustments to the air/fuel ratio.BMW ICOM A3 Pro These adjustments help to optimize fuel economy and horsepower while reducing emissions. When your SL's oxygen sensor fails, your fuel consumption will increase noticeably, and your general engine performance will decrease.
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Raise the Saturn SL onto jack stands. To do this, jack up on the front jack point behind the radiator and place a jack stand under each of the jack stand points under the driver and passenger side doors.MVP Key Programmer These points are pinch welds and are part of the unibody construction of the SL. Then, lower the vehicle onto the stands.

Climb under the vehicle and disconnect the lead wires from the oxygen sensor which is located near the catalytic converter--the egg-shaped component inline with the exhaust) Depending on your model year, you may have one or two sensors.
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Unbolt the oxygen sensor or sensors using an O2 sensor socket and socket wrench.

Remove the oxygen sensor from the exhaust and insert a new oxygen sensor.Digiprog III Thread and tighten the new sensor using an O2 sensor socket and socket wrench.

Reconnect the electrical leads to the sensor and lower the Saturn to the ground.