Hey 2nd genners,

I'm trying to diagnose wiring issues here and have found a short to ground and all things point to oxygen sensor heaters.

Does anyone know what our ntk 02 sensor heater circuits resistance should read, unplugged?

It seems that for most varieties 10Ω to 20Ω is healthy but I know Chrysler 02s are a different story.

I'm getting 2.5Ω across the circuit with both sensors inline. (Testing between an injector + feed to the 02 heater ground (disconnected from block).)
This seems super low, even knowing that the resistance will increase with heat.

Thoughts? Thanks all!

 

Looks perfect, the heater resistance is 4.5 ohms at 70F. Two sensors in parallel divide this by 2.