the cel said something about o2 sensor low reading (i dont exactly remember, something about being low or slow reading/voltage), does that mean my 02 sensor is bad, or something else is causing a low/slow reading

 

it would help if we had the code to better help you... what P number did they give you? P0135? P0141?

 

i've had an o2 sensor CEL for almost three years now h:

 

that's not really much of a diagnosis, is it?
if you can get to the o2 sensor and get a voltmeter to it... do it. take a look at the numbers going back to the pcm. get a $2 bottle of propane with a on/off valve and shoot some propane into the intake. see if the voltage on the o2 increases.

if it increases really fast... like in less than a second... your o2 is fine.
if it doesn't change or changes slowly (like .2v going to .8 volts in like 5 seconds), you go a lazy or defective o2.. then replace it.

 

It depends, if your O2 sensor was still in closed loop or if it was operating in open loop after it warmed up a little bit.

 

That is about 10 times harder than the HELMS method.

In the online resources thread at the top of this section there is a download for the 5th and 6th gen civic HELMS manuals. Find out what the P code is and do the troubleshooting methods listed in there. It will require a multimeter with continuity, voltage, and resistance capabilities.

hih

 

don't really remember, but if i had to choose P0135 looks more familair

 

sounded more like this "P0133 Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1. "

 

i reset it, have yet to come back on

 

If it does, use that HELMS manual to troubleshoot it. :goodjob: