How to replace oxygen sensor

Hi Daniel,here's a video showing you how to replace your oxygen sensors. 2008 Jeep Patriot O2 Sensor Replacement Here's a link to your sensors. Bosch Oxygen Sensor 15124 Read 1 Reviews on Bosch 15124 They are both the same.Here's a link to the other one which is the same part number. Bosch Oxygen Sensor 15124 Read 1 Reviews on Bosch 15124

You have two oxygen sensors but 21 is upstream sensor. This is the sensor between engine and catalytic converter. There is three possible problems that it could be.
1 oxygen sensor input voltage maintained above the normal operating range.
2 no signal at 02 2/1 sensor
3 oxygen sensor input voltage sustained above thenormal operating range. What all this means is you need to replace the sensor.
when getting the replacement this is your O2 2/1 sensor.

how do I replace an o2 sensor in a 1997 Jeep Cherokee ?

if i remember right code 45 is oxygen sensor, it shouldn't cause a drivability problem but should be replaced as it controls fuel mixture

Hi,
This is a broad spectrum of possibilities. I would first start with a simple approach of insuring good gas.
When these symptoms occur, get a bottle of fuel additive and add to your tank. Possibly you have some condensation issues. This could be just the ticket... I hope so. Good luck.

does the jeep run rough and blow black smoke if so it will be the oxygen sensor if not i would try plugs and a air filter.

YEP A BAD OXYGEN SENSOR WILL CAUSE ENGINE TO RUN RICH.CAUSING UNBURN FUEL TO GO TO THE CATALYTIC CONVERTER AND BURN IT OUT.

Unplug sensor cable from connector. Use 7/8" Oxygen Sensor socket, available at most auto supply and tool stores for around $10, to remove the sensor (It's a deep well with a slot cut up the side to clear the four wires that come out of the end of the sensor) . Insert new sensor using the same socket. The threads should have anti-seize compound already applied to them by the manufacturer. That is adequate. Plug the sensor connector into it's mate. That one is done. There are two Oxygen sensors on my '97 Wrangler. One is in the downpipe just after the connection to the exhaust manifold and the other is just after the catalytic converter. Easy to do!

Try replacing the Oxygen Sensors... I had the same problem and replaced my Oxygen Sensors and I haven't had any problems since.

My 97 cherokee catalytic converter was stolen, oxygen sensor wires cut. the replacement is black, grey and white. the jeep is different color. i need help knowing which wires get connected to which.