Question about Jeep Wrangler

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I cannot get my o2 sensor after my cat off cuz of the tight spaces underneath is there anything you can tell me that could possibly help it's on a jeep wrangler 2000

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You may do well to get an offset wrench to get in there.
Often if a sensor was installed previously without using anti-seize compound you will not get it out unless the pipe is heated using an oxy-acetylene torch. If that has happened and you don't use heat, you will destroy the sensor or the threads in the pipe before you get it out.

Posted on Sep 16, 2010

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2003 chevy avalancheCode p0420 how to fix this


Code 420 is for a possible problem with the catalytic converter. The computer uses data from the front and rear O2 sensor to monitor cat activity. The sensors are telling the computer the cat is not performing correctly.
The problem could be the cat or something else such as the fuel system.

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1997 ford f150


your truck should have four o2 sensors bank 1 sensor 1 is o2 sensor on cylinder 1 side before cat and bank1 sensor2 two is 02 sensor after cat banks 2 sensor1 is on other side berfore cat and bank2 sensor2 is after cat hope that helps when they read code it should tell you bank1 sensor1 or2 good luck

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there are 4 o2 sensors. one on each bank after the cat. converters, one before the muffler and one on the muffler.

chances are it one of the o2 sensors by the cat converters.

check you Mass Air Sensor and replace spark plugs, because there is probably something simple that wrecked your o2 sensor in the first place and it will help your vehicle run and last longer. It could be more complicated, like a vacuum leak cuz honda civics are known to have head gaskets replaced.

But i guess first you need to figure out which o2 sensor it is.

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It will hurt your fuel economy,performance and the environment.

When the catalytic converter is completely clogged. The body of the cat. will glow red hot and melt the surround material.

Example: interior carpet.


Don't for the distinctive sulfur smell.


In short, you should replace the catalytic converter as soon as possible.


Please rate my answer if it's help to you.


Cheers,


Mustgo








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po420 and430 is telling that the catalyst converters are no good both, most of the time bad o2 sensors maake computer think cat is no good, the way it tests is if o2 sensor reading before cat is about the same as the one after cat computer asumes cat is not bruning exhaust good , iwould replace o2 sensors reset check engine light and go from there, that might be the problem,if you were to replace cat o2s should be done at that time,so do o2s first,good luck.

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If O2 sensor is bad it can cause Rough running. Are you sure it is the O2 sensor ratteling? Have you taken it out to hear Rattle? Is it loose? I have not Hears an O2 Sensor rattle. I have heard Converters Rattle. over time Inner Material of converter will Not have a tight fit due to heating and cooling. expanding and contracting. carses some of the material to wear away. Causing the it to rattle. and can cause rough running also.

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if the code is for the rear cat o2 sensor i suggested to replace the cat. the rear o2 sensor is to tell the commputer ha good is the cats if the cat not burning the gas. the commputer need to see the o2 sensor to check the cat's

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It sounds like you may have a broken exhaust valve spring, although, like you have found out problems like this can be very hard to diagnose, but anyone with a compression tester and couple other tools could find out if this is the case. Hope this gives you another idea where to look.

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The O2 sensor is before the cat, the cat performance monitor (which looks like an O2 sensor) is after the cat.

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"Up-stream" means before the catalytic converters and are probably in the header pipe(s). The "down-stream" O2 sensors are behind the cats in the exhaust system, usually just behind them. Not the expert here on this particular car but there are probably 4 of these sensors. BMW exhaust systems are very tight on space, be careful tackling this job.

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