2000 durango we replaced the pcv and your gas mileage has dropped What could be the cause Could it be the o2 sensors Also after the engine warms up it idles rough Any ideas what could cause that?

A 2007 Durango has four oxygen sensors.

On top of the rear axle. This is from pictures I've seen from guy that replaced their own sensors. ...

Gas mileage also went down and I just replaced o2 sensors.

It is one of the oxegon sensors, I just replaced one myself on my 97 GTP.

All of the engine sensors can affect fuel mileage.

They are replaced when they go bad.

No, different sensors, plugs, bellhousing.

On either side of the catalyitc converters.

Yes, on the rear axle, on the trans, and possibly at the front wheels.

Yes. Yes.

If the oxygen sensors for the 1991 Chevy 4.3 is running rich when it is warmed up it is best to have the sensors replaced. Once the sensors are replaced this should resolve the issue. ...

Tires do not have oxygen sensors. They can have pressure sensors. The lack of pressure sensors would have no affect on fuel economy. ...

any car after 1995 has two, or four oxygen sensors,as they use OBDII system ...

California emissions= 4. All other states= 2.

Have you had your 4 oxygen sensors replaced? It turns out when they replaced my oxygen sensors, they were after market parts so the service engine light did not come and gave codes even though they were replaced. ...

Possibly the O2 sensors need replacing. There's one in each exhaust manifold. ...

i had a problem with that on a dodge neon and i did the same things you did to fix the problem but it kept shutting down. Well to make a long story short it tuned out to be the computer( brainbox). replaced it and have not had a problem. This was common to the neon not sure on the durango but mabey something to look into ...

No, they will need replaced if defective.

It would fit, but the engine will not run. The 2005 uses a different computer with different tone wheels inside the engine for the cam and crank sensors. ...

4 sensors total. 2 upstream on either side of exhaust manifold, 1 left side downstream, 1 right side downstream. ...

Yes Yes

there are 4. one on each exhaust downpipe and one before and after the cat. ...

Yes, but the computers, wiring, hoses, sensors, accessories all also have to be swapped. ...

The PCM uses a dozen sensors that are located all over the engine.

As far as I know they can not be cleaned. Must be replaced.