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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Re: Bad o2 sensor at back
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.
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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.
there are mant people out there that say a good tech can see if the sensors are bad, ture and not,you can test a sensor by watching the reading and also changing them to see how fast a sensor can react and theres more to it but i wont bore you.
MY point is , i have replaced bad o2 sensors and then the converter is bad, now the customer is not happy as the quote just went up alot. then i replace a bad converter and then find an o2 that worked a week ago is now slowed down,
This is to keep in mind if its a converter and the o2 sensors are old replace them, they may be working now but lets say they slow down but not enough to turn engine light on which i see alot, then a year later you wonder why you must buy another converter.
first of all you need to have your cpu read with an OBD reader then it will pin point the excact O2 sensor usually autozone or kragens will read it for free i know that pepboys reads it for free just have to make sure they have the time to do it
If it is a 4 cylinder it will be on the exhaust manifold at the front, a V6 is also mounted at the front, but lower down. If you are getting an O2 sensor code, change the fuel filter first. O2 sensor seldom go bad.
Your O2 sensor has been running for a long long time. OBD 2 checks both O2 sensors *(pre and post catalyst) to confirm it is just a bad sensor and not an out of range sensor condition or catalyst problem.
If your exhaust system was plugged you would hear it as a loud hissing noise of exhaust escaping any way it could before the plug. You would also notice nothing coming out of the back of the exhaust system. Both easy to rule out.
Replace the appropiate O2 sensor, reset your computer, and drive!
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.
check the fuses , you can have a o2 sensor fuse open, also check the wiring because o2s are close to the cats or manifoldss some time they burn and get shorted.., other thing you can do is unplug the o2s and drive it like that and see if it shuts off , if it doesn't so the problem is around that sensor...hope this help..
What were the codes??? You should have gotten one code if it was only one O2 sensor that went bad. If all three O 2 sensor went bad you would have gotten three different codes. P0031 (bank1 sensor1) P0051 (bank2 sensor2) P0061 to P0064 O2 sensor after the catalytic. Hops this helps.
are you sure that it is still the O2 censor? are you assuming because the check engine light is still on? because you have to reset it after fixing something you just disconnect your battery completely for a bit like 15mins and then reconnect it and the light should go away.