Question about 1999 Dodge Avenger

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Bad o2 sensor at back

I have a 1999 dodge avenger V6. The O2 sensor at the back is bad. I have not had it replaced yet. Today I noticed my car when I started to stop wanted to cut off. The tachometer hand went to to zero then back up. When I took off from the light it kind of stuttered along. I also need front brakes. I have not had a tune up either. Also when I put my car into drive when the car is cold the tachometer hand goes to zero and then back up . Could you please tell me what is wrong with my car? The service engine light is on also. The guy at the shop said it was because of the O2 sensor.

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LIKE I TELL MY CUSTOMERS...FOR STARTERS YOU NEED BRAKES BECAUSE IF IT DOESNT STOP IT DOESNT MATTER.IF THE O2 SENSOR IS BAD THAT WILL THROW OFF THE WHOLE EMMISSIONS SYSTEM.WHICH CAN CLOG YOU INJECTORS,RUIN YOUR PLUGS,CAUSE YOUR CHECK ENGINE LIGHT ON ECT.YOUR COMPUTER KNOWS THERE IS A PROBLEM & THE CAR WONT RUN WELL UNTIL ITS FIXED.STEP 1- BRAKES,02 SENSOR,TUNE UP,OIL CHANGE....WHATEVER ELSE YOU NEED.I KNOW IT STINKS.,JUST DO IT ONCE & DO IT RIGHT.

Posted on Jan 16, 2009

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1999 cougar with 2.5 4020 code


There is no such code for any car. this 1999 cougar with the 2.5 engine has a code and i think you may have mixed the numbers the only code thats close is the po420.

Code po 420 is the cataylic converter efficency, this means the converter is not cleaning the exhaust to specs anymore and may be bad.

I have found that i lot of times a bad o2 sensor is the cause of this or both o2 sensors as in this car,i have found that its good thing when a converter is replaced that the o2 sensors should always be replaced. this will cost more but is the correct way to do the job. what i do is replace the o2 sensors first and then reset the light and then if light doesnt come back problem is fixxed.
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