MrMileHighGuy

The sensor on the up pipe is a temperature sensor that provides temp data to the ECU. The ECU knows that a certain range of voltage is "good" so therefore won't produce a CEL. 2.2k ohm of resistance put that voltage in the correct range, tricking the ECU into thinking there is an operational sensor.

 

Now, for your airbag sensor, it's hard to say what the ECU is expecting. So that's the million dollar question, what resistor. I have read both a 2.2 ohm and 3.3 ohm (NOT 2.2k or 3.3k ohm which is 2200/3300, but 2.2/3.3) resistors are correct. I guess it depends on the car, but the concept is exactly the same as this. I'd suggest searching "seat airbag resistor" for your particular car

Your saying you've read that its a 2.2 or 3.3 ohm for airbag sensors? or in this statement are you referring to the up pipe temp sensor from this original thread?

Can anyone tell me how and why the specifics were determined to using 2.2k ohm .5 watt resistor?

I'm looking to use this method in another vehicle. I swapped seats. The originals had a side airbag. The new ones do not have this airbag but are from the same model vehicle. After installing the new seats the plugs all plug in but there is not yellow plug (airbag) to plug into the harness on the car side. Therefor the vehicle thinks that the seat airbag sensor is not plugged in. and a light on the dash is now displayed.

I was thinking of using this method to trick the sensor into thinking its plugged in. How do I know that I should use 2.2k ohm .5 or a different spec?