O2 sensor heater DTC

[x Spades x]

Just tape a $50 in front of the OBD port.

😆 🤣 😂

[PSUEng]

I love going to San Diego for work and would probably enjoy living there--at the beach, surfing, out in the desert with my truck, great food, (seemingly) nice people. But all the Cali car rules and just admin burden of existing there seem excessive.

[x Spades x]

Here is a video of my O2 sensor activity. Anything strange?

[AWE46M3]

Already done the drive cycles to activate the monitors?

[eacmen]

In my experience O2 sensor heater monitor goes ready within a few minutes of starting the car. Shouldnt need a drive cycle for that monitor.

[AWE46M3]

In my experience O2 sensor heater monitor goes ready within a few minutes of starting the car. Shouldnt need a drive cycle for that monitor.

When I bought my M3 in 2022 and needed to pass smog in California to register it, my post-cat O2 sensors didn’t activate until I followed this specific sequence. Beforehand, I had European Auto Source reflash the ECU to ensure there were no tunes or monitor-suppressing parameters left from the previous owner.

Despite a 3-hour drive home from Anaheim, my post-cat O2 sensors stayed off the entire time. After joining the forums, I found this chart and completed the drive cycle as outlined, which successfully turned the monitor on. My experience ended up being the exact opposite of yours. Makes me wonder if the DME version could be a factor.

Just throwing this out as another potential approach while we brainstorm.

[x Spades x]

Already done the drive cycles to activate the monitors?

Yeah, I've done them like 30 times over the past 1,000 miles.

[eacmen]

When I bought my M3 in 2022 and needed to pass smog in California to register it, my post-cat O2 sensors didn't activate until I followed this specific sequence. Beforehand, I had European Auto Source reflash the ECU to ensure there were no tunes or monitor-suppressing parameters left from the previous owner.

Despite a 3-hour drive home from Anaheim, my post-cat O2 sensors stayed off the entire time. After joining the forums, I found this chart and completed the drive cycle as outlined, which successfully turned the monitor on. My experience ended up being the exact opposite of yours. Makes me wonder if the DME version could be a factor.

Just throwing this out as another potential approach while we brainstorm.

I completely agree the drive cycle is important. What you're describing is how I've experienced the O2 Sensor monitor. The O2 Sensor Heater monitor is a separate monitor and can usually go ready as the ECU knows fairly easily whether the heater is working or not.

[x Spades x]

I've checked the wiring to the ECU and all looks good

[x Spades x]

This is how my tune is set up.
I need to get everything readied up (except Evap, bc that seems to take forever).
Is this correct? Also will my SAP ready with the DTC being suppressed?

My mods:
2005 SMG
CSL ECU (H Bridge)
Karbonius airbox w/ CSL flap
288/280 Schrick cams
SSV1 headers
SSV1 Sec 1 with HFC
SS Sec 2 63.5mm non resonated
Scorza exhaust
SAP deleted
E-fan
Brand new pre-cat O2 sensors

[AWE46M3]

I completely agree the drive cycle is important. What you're describing is how I've experienced the O2 Sensor monitor. The O2 Sensor Heater monitor is a separate monitor and can usually go ready as the ECU knows fairly easily whether the heater is working or not.

Gotcha! I’ve always figured they were two sides for the same coin. Thanks for clarifying 🤙🏽

[x Spades x]

I completely agree the drive cycle is important. What you're describing is how I've experienced the O2 Sensor monitor. The O2 Sensor Heater monitor is a separate monitor and can usually go ready as the ECU knows fairly easily whether the heater is working or not.

So do I need to enable rear O2 DTC to get the heaters to ready?

[eacmen]

So do I need to enable rear O2 DTC to get the heaters to ready?

To be honest I am not 100% sure. The tune I have disabled the rear O2 so there was no CEL. But I still needed to have the rear O2 sensors connected but zip tied to the side.

[sapote]

So do I need to enable rear O2 DTC to get the heaters to ready?

No.
The precat sensors are not dependent to postcat status.

[sapote]

I've checked the wiring to the ECU and all looks good

How?
I need the data in my previous suggestion to help.