Replaced o2 sensor but check engine light back on?

Question

My check engine light on my '97 chevy k1500 came on after I had my transmission rebuilt. I had the code read at an advance auto parts store and it read that the o2 sensor 1 bank 1 showed no activity. I replaced this o2 sensor and had my computer reset. about 15mi. down the road the check engine light came back on. I had it scanned again and it came up with the same thing. Now I don't know what to do. any help would be greatly appreciated.

Answer 1

If the O2 sensor is showing no activity and you just had it replaced then that means the wire leading up to it are bad. If it had an out of range code then it could be a dead cylinder (i.e. cylinder that is getting gas but not spark/compression) if you understand electricity well and have a multimeter you can easily check them yourself, if the wires are all fine then it is an issue with computer (I would make sure the brand new O2 sensor wasn't just a dud before I worry about the computer at all)

Answer 2

There is no definitive answer, but for six weeks of moderate driving, long term damage is unlikely. Increased fuel consumption may occur with a failed oxygen sensor if your car inherently runs rich, meaning the fuel system is flowing more than necessary to run at optimal condtions (stoichiometric air/fuel ratio). However, if it runs lean, then you are actually saving fuel, but the exhaust components (exhaust valves, exhaust A-pipe, catalytic converter) will run hotter. If this is allowed uncorrected long-term, you will damage these components, usually with the catalytic converter. To give a background to the above, the O2 sensor indicates the amount of oxygen flow in your exhaust. The engine computer uses it to regulate how much fuel should be injected. If the sensor indicates that the exhaust gas oxygen content is too high (lean), it will inject more fuel than its base fuel maps. If the oxygen content is too low (rich), it will subtract fuel from its base fuel maps. Furthermore, each car is different. One can physically run rich (more fuel than necessary, unless the O2 sensor and engine computer) correct it. In this case, fuel consumption is higher. The opposite can occur, when it is lean. Anyway, it is good that you are getting it fixed soon, but you probably didn't hurt your car.

Answer 3

I have a feeling the wrong O2 sensor was replaced..... Bank one, sensor 1 should be the O2 sensor before the cat on the side of the number 1 cylinder of your engine.

Answer 4

Here is somethings you might have have figered on.
Alot of aftermarket O2 sensors will not work on cirten cars.
The factory O2 sensers will only work.
It is possable to test a O2Senser . Have it check. It is possable that the one you got may not work in your car.
Here is something else
Lets say that the person before you got a new senser and put it in his car. He then put the old one back in the box and brought it back and said it dident work and got his money back. They put it back on the shelf and then you got it. Have it tested and see if you got a good one.

Answer 5

Depends on how you had you computer reset. If you just disconnect your battery in your truck and let it set for about 15 minutes alot of times the check engine light will go off and stay off. My husband had this problem and it was a SENSOR for a SENSOR etc...about $500 later our neighbor told us about this trick and it seems to work well.

Answer 6

IT HAS MORE THAN ONE SENSOR take to auto zone
have them check (free) was told that some employ es are not good at using code reader also use good brand of gas
no cheap brand ,this helped my 96 s10. yes you can un hook your battery but that does not solve your problem

Answer 7

Make sure you replace the right oxygen sensor.

Answer 8

ITS ONLY 1 OF 3 THINGS . O2 SENSOR,EGR VALVE OR CATALATIC CONVERTER.

Answer 9

i would take it to a shop and have the cat checked it my be getting blocked.

Answer 10

NOPE!!!
the spark plugs are not burning.
now ,You are there, replace wires ,rotor and cap.