steven88

iTrader: (28)

Alright, I wanted to discuss with u guys about my o2 sensor woes...here it goes

I have a 2k2 with headers and a test pipe...my SECONDARY o2 sensors are simulated by a dual output sim...my PRIMARY is stock except the wires have been extended since it would not reach the cattman bungs...

I been throwing a 0138 and sometimes a 0158 as well...0138 is for heated oxygen sensor 2 bank 1 HIGH voltage...0158 is for heated oxygen sensor 2 bank 2 HIGH voltage...an o2 simulator should take care of these problems since its constantly sending a certain voltage to keep the SECONDARY o2 sensors working...but i'm still throwing these codes....is it possible that my secondaries failed, I will still throw these codes even with them simulated?

Weird thing is, if i disconnect both my PRIMARY o2s, my 0138 and 0158 go away...and I only get a 0031 and 0051...they are heated oxygen sensor 1 bank 1 and heated oxygen sensor 1 bank 2 respectively....why is it that when I disconnect these PRIMARIES, that my SECONDARY o2 sensor codes (0138 0158) go away?

I am going to check the connections soon...I dunno what could be wrong with them...my simulator LED blinks and I'm sure its working fine...and only when I disconnect my PRIMARIES, the SECONDARY codes go away (meaning they are working)...only if my PRIMARIES are connected, the SECONDARY codes come on...kinda weird....but discuss away fellas!

ChromeSE5

iTrader: (3)

The heated sensor has nothing to do with the o2 sim, IIRC from the o2sim forums. The thread posted has to do with using a resistor to bypass the o2 sensor heater. When I installed my o2 sensor, the heater wire is the only thing I did not splice, cut, or touch. It says that you should get some cheap resistor or something and tap into the heater wire for the o2 sensor.
http://www.o2simulator.com/discus/messages/50/154.html

Hope this helps.

steven88

iTrader: (28)

Thanks for the tip chromese5...but your thinking of the wrong part...I'm talking about the HEATED OXYGEN SENSOR 1....not heated oxygen sensor heater wire....my current HEATER WIRE is left untouched becuz if I cut that wire, it will throw an SES for heater malfunction....

ChromeSE5

iTrader: (3)

I mentioned that it could be the heater wire is because that can still go bad even though the o2 sims are working correctly.

But if it is the whole sensor then, you can use a multimeter and check if the o2 sim is working correctly.
http://www.o2simulator.com/discus/me...tml?1108217369

Hopefully you solve this problem. I just had to get my smog done and I had my o2sim installed... it was like taking final exam because I was throwing a stuff load of codes including the p0138, even though my o2sim was installed. Lucky for me, my harness was the thing that popped off because I did not clip it in properly. Go figure.

steven88

iTrader: (28)

Thanks....heres the weird part though...everytime I disconnect my PRIMARY o2 sensors, I stop getting the 0138 and 0158....I only throw 0031 and 0051 which are for PRIMARY o2 sensor...what could be an explaination of that?

Puppetmaster

iTrader: (48)

Have you tried swapping the secondaries for some that you know are working? I know you have the sim, but this is to check the heater wires on the O2s themselves.

It seems odd to me that both heater codes are coming on, which leads me to think maybe its the sim. I don't have much time now but I'll hit you up on AIM later.

Puppetmaster

iTrader: (48)

I'm not sure how that's related.... but do you mean disconnect the primaries with the secondaries still hooked up? Or with both the primaries and secondaries disconnected?

steven88

iTrader: (28)

Both primaries are DISCONNECTED....secondaries are NOT disconnected as it is simulated...and its bunched up together in electrical tape...

Larrio

iTrader: (10)

P0138 just means that the ECU is not reading the minimum voltage (0.6V) from the secondary o2 sensor. The ECU looks for a reading between 0.6-1.0V in a oscillating pattern. The o2 sim can be working (blinking) but not putting out the required voltage required.

You'll need to use a multimeter and check the voltage put out on the WHITE signal wire from the o2 sim. If it is not at least 0.6V, that would explain your P0138 code.

As for your other issue, I can't explain that one

NmexMAX

iTrader: (22)

This is a bad idea since there is no actual readings being sent to the ECU, since the primaries are non-exsistent and the secondaries are being simmed.

steven88

iTrader: (28)

You know I thought of this too...but my gas mileage has stayed the same....and my car doesn't misfire during slight load with the primary connected

igzy

iTrader: (18)

If you disconnect your primaries ECM will then see 0V from primaries and in turn will throw low voltage error codes for primaries...

igzy

iTrader: (18)

And that is how it should be for mileage when looking at secondary O2s, as the secondaries only monitor the exhaust oxygen level and do not set the fuel trim levels... Fuel trim is adjusted by primaries...

Puppetmaster

iTrader: (48)

Right, but when the primaries are absent or malfunctioning, the ECU will try to use the secondaries to adjust AF. That's what I understand from the FSM. In this case, they will be using the simulated voltage somehow. However, I believe BlackbirdVQ has posted in the past that this isn't always the case and there are stored maps that are used when the primaries aren't working.

igzy

iTrader: (18)

Yeah, Im in the same boat when it comes to it... I understood from some readings too that in case all fail that there is a default map ECM will go to...