99 suburban 02 sensor no activity trouble code?

Question

I have 99 chevy suburban and I installed a universAl replacement o/ sensor after the converter. I immediatly got a no activity code on that sensor. I checked and found the ground wire and the two heater wires all had continuity. The ground and heater wires all had continuity with the outter body also. So I replaced it with a store baught complete replacement , pig tail and all. I am still getting this trouble code. Could I have shorted the wiring or the ECM. The truck runs great other than the check engine light is on.

Answer 1

You might have bought a bad sensor. You should also check your fuse and try another sensor.

Did you make sure to clear the codes after you changed it?



Get a manual and look it over it should have some info on how to test them



As a last resort you could try another PCM if you wanted to spend the money for one and to have it programmed.



Good Luck!

Answer 2

Besides the O2 sensor, there's either a mass airflow sensor or map sensor used to calculate air temperature and density. If these are messed up then the air/fuel ratio will be messed up which will cause the O2 sensors to read a problem. The computer codes dont necessarily mean the sensor is bad, it could be that the sensor cant calculate the difference because they are made to operate within a range. If there's an Idle control valve, that can cause some problems. They have a tendency to stick and restrict flow or let too much air in. Dont forget to check for vacuum leaks. The computers cant usually catch these and it will result in a lean burn. The O2 sensors will catch it, but nothing else will because the most air/fuel sensors are before the intake manifold, which is usually where the leaks are.

Answer 3

don't wast your time with those after market o2 sensors or any after marker sensor in fact.

Those hack on the old pig tail sensors are junk. Gm o2 senors get a o2 reference signal from some how reading the out side air through the pig tail, sounds like a load of b/s I know but its true if you start cutting and hack the wires it adds resistance cause the sensor to no longer read right

first get a GM sensor and try that there are two fuses for the sensor heaters that you may want to check

you all so have to clear the code with a scan tool as well just replacing the sensor will not clear the code



and just a side note the rear sensors are not used for engine control they are only used to check emissions the ECM will check to see if there is a difference in the o2 readings between the post and after converter sensors to make sure the converter is working . this sensor plays no role in how well the engine runs...