I have completed the wide band o2 sensor it works great other than I need to reduce the amount of time it takes for the Sensor to heat up. I read on the Diy website that resistors are added on r4 until the warmup time is under 50 seconds. Does any body know the value of the resistors that need to be added?

Thanks

 

From the kit the add on resistors are 15 ohm. Typically took 3 of them. So a single 5 ohm would do the trick. The add ons are 1/4W resistors.

Just be sure that it takes at least 20 seconds to warm up. Any faster is not good.

RBob.

 

Thanks,

It takes 80 seconds right now to warm up. Ill ad the resistors and give it another try.

 

Hey I tried adding a 10 Ohm and 5 ohm to resisor to r4

It does warm up a little faster but is affects the output voltage to the dvm. Without the resistor the dvm will go from 2.5 volts warm up, to 4.05 In other words the meter goes directly to 4.05 volts when the led comes on. With the resistor added, when the led goes on the dvm goes to 3.6 volts. Then it slowly goes up to 4.05 volts over about 4 seconds time.
It also only works for a few seconds before the led dims down like it is going to go out.

The circut is getting plenty of power, Directly off the battery with the car running, 14-15 volts.

Why is it important that the circut warm up under a minute?

Thanks for the Info