O2 Heater Sensor and Smog

[roaringpanda]

Replaced the battery on my 2004 X5 3.0 6sp and been trying to get the ECU monitors readied for smog (which is already overdue). The only system left that's not ready is the O2 heater. The O2, evap, and all that are ready, but the O2 heater seems to stay NOT READY forever. Using a foxwell scanner.

This is my 3rd car and barely gets driven, so it's taken a month of on and off driving just to get to this point. Does anyone know if the O2 heater system is required for smog, or if the E53 X5 even has an O2 heater system?

[aureliusmax]

Originally Posted by roaringpanda

Replaced the battery on my 2004 X5 3.0 6sp and been trying to get the ECU monitors readied for smog (which is already overdue). The only system left that's not ready is the O2 heater. The O2, evap, and all that are ready, but the O2 heater seems to stay NOT READY forever. Using a foxwell scanner.

This is my 3rd car and barely gets driven, so it's taken a month of on and off driving just to get to this point. Does anyone know if the O2 heater system is required for smog, or if the E53 X5 even has an O2 heater system?

every 4 wire oxygen sensor contains a heater and a sensor element. it just means you need to unplug the sensor in question, and meter test the pins that correspond to the internal heater wire and look for about 2-5 ohms of resistance. if it's open, the sensor is no good.

[andrewwynn]

Get live readings on all your O₂. If they don't heat up they won't read properly you can figure out which one is the trouble. You should also have a code on a specific sensor.

I fought with heater errors on new sensors for a month. If there are no other errors and the heater measures about 2 Ω as mentioned there's a procedure that worked for me to recalibrate the DME to recognize the heater is working (DME measures the current going though the heaters. If it changes too much it will flag an error).

[oldskewel]

This thread covers my journey with the O2 sensor heater readiness on my 2001 3.0i.

https://xoutpost.com/bmw-sav-forums/...ncomplete.html

For your specific questions,

In California, you do not need to have the EVAP readiness ready, but all others do need to be ready or N/A.

All 4 O2 sensors on these cars are 4-wire, with two of those wires for the heater.

Specific details from the thread linked above:
I had been delaying actual sensor replacement, testing heater resistances, etc. (one challenge with that is that the resistance will be different when the heater is actually heating, which the car knows about, but I do not), and finding everything good except the readiness.

Then finally replaced the downstream sensors (upstream ones were relatively new). It then took 205 miles of normal mixed driving for the readiness to be ready.

"So at some point, even after testing the 3-year old Bosch upstream sensor heaters, the original upstream ones, and the original downstream ones - all as good and self-consistent resistance values; no O2 codes - I figured it was easier to at least replace the downstream sensors, so I did with new Bosch 15109 ones, at 198,728 miles.

It was not until 198,933 (205 miles later, with a mix of city and highway driving) that the final monitor completed."