Oxygen Sensors

The Downstream O2 sensor is faulty and needs to be replaced.

1980 is when they started putting oxygen sensors in cars and back then they only put one in the car. 1996 is when the OBD II system came out and they started putting more sensors in the cars sometimes up to 4. There is usually one oxygen sensor on the exhaust manifold itself which measures the amount of unburned oxygen. Then there is one after the catalytic converter which measures the oxygen level after its cleaned by the catalytic converter.

If there are specific hazards or issues with an O2 sensor then adjust these instructions accordingly.

There are four simple steps to try initially:

1) Clean up the seized fastener... use a combination of degreasers, detergents, abrasives. DON'T use wire brushes in this instance, stick with plastic. This sets things up for the next step...

2) Search for the term "penetrating lubricant". These are specially formulated to squeeze into the small spaces in fastener threads. Use the lubricant liberally. Use plastic brushes to work it in, further cleansing the area.

3) Try to rock the fastener in both directions... particularly effective if it starts to come undone then jams. Add more lube as you go... it should rock a little further each time until it frees up. if not...

4) If seized absolutely solid try a freeze and release spray... very effective and much safer than heat around delicate electrics. Check the product to ensure it is safe around electrics as this is a special situation.

Could be a faulty o2 sensor. Try replacing your downstream o2 sensor. Also, it could be a bad catalytic converter. Try checking for vaccum leaks in or around the intake manifold. (O rings usually are the culprats)

No.

The outward appearance of a defective oxygen sensor is no different than the appearance of a brand new one. The components that fail are internal and cannot be repaired ... direct replacement is the only fix.

It depends on the year, make, model, and engine. They are always in the exhaust stream near the engine.

In the exhaust system either before and /or after the catalytic converter?

Oxygen sensors are important to have in a car. The price of one can run from $40-$200+, depending on where, what model, and any other specifics, when bought.

The O2 sensors are located on either side of the catalytic converter in the exhaust system.

After the catalytic converter on the same side as cylinder #1

The oxygen sensor on the 1987 Dodge D150 1/2-ton pickup with 2-wheel drive and a 3.7 liter 1Bl 6-cylinder engine is mounted in the exhaust manifold, next to the transmission bell housing. Check under the hood in the rear engine area on the driver's side.

Bank one is the same side of the engine as cylinder 1.

There are two O2 sensors on a 2005 Grand Caravan and are located as follows: On 2.4 L four-cylinder engines, the upstream oxygen sensor is located on top of the exhaust manifold, above the flange. On 3.3L/3.8L V6 engines, the upstream sensor is located on top of the rear exhaust manifold, above the flange. The downstream oxygen sensor is located on the side of the catalytic converter on all models.

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It is located on the exhaust pipe right where the exhaust manifold connects to the exhaust pipe. It is easy to replace and you can rent the tool from most auto parts stores.

Bank 2, oxygen sensor #1, is located towards the left front (drivers) side of the vehicle. It will be directly forward of the catalytic converter, and to the left of the transmission pan.

its screwed into the exhaust manifold,undo wire and unscrew at manifold.

The 1998 Toyota Avalon oxygen sensor fuse can be found in the fuse box. The oxygen sensor fuse will be the number 17 fuse.

Usually after your catalytic converter. Usually after your catalytic converter.

No,but for fuel efficiency it is best. All the emission devices have a purpose and all work together for the good of the engine.

bank 2 sensor 2 is the passenger side, rear sensor, it is located behide the catalytic converter.

Low gas milege is an indication of a bad oxygen sensor and/or it's wiring. A lack of power, increasing vibration in car's floor and cabin area(s), high RPM's at highway speeds.