Engine Cycle Suggestions - Emissions Rejected

[Tbonem3]

What does catalyst have to do with pre cat o2s?

[marksae]

I was able to get my car to pass the catalyst readiness monitor with euro headers. I changed out my front o2 sensors. I cruised on the freeway using cruise control at 60 mph for about 10 minutes. I had the OBD2 reader plugged in and just checked it while I was driving.

[heinzboehmer]

Trying to get my drive cycle done, but have been having issues. Checked the monitors status with torque and obd fusion and both show that none of my monitor are available.



I have a DME that was originally a non-HP that I converted into an HP. I tried with a completely stock 2501 binary and with one that I modified to remove the 151 DTC. Same results with both. I've probably druven the car 150 mi since the last flash.

Anyone know what could be could be going on?

[Nate047]

Had to go through this myself recently. I had to drive 55 on the freeway and even at 2am I felt like I was gonna die the whole time lol. Do what Estoril posted, and regarding the O2 sensors, see if you can get passed without changing them. If you do the cycle correct and the cat monitors are still not ready, swap those O2 sensors out.

[Estoril]

Based on my morning experience at the Emissions Station - I'm going to get the chance to give this a go again. I got a "Not Ready" on my track car. It hasn't been driven at all in the past 3 weeks. Not sure how long not driven but no codes triggers this.

[sdmcoupe]

I tried numerous drive cycles w/o success. I was running out of time so was looking at all options. I tried a product called "Cataclean". I wasn't expecting it to work but after pouring it in with a 1/4 tank of gas left and a short drive, my CAT monitor set itself to OK. Took the car in and it passed smog w/o issue. So relieved.

My car has 79k so I was confident i wasn't having an issue with actual catalytic converter.

[eacmen]

So… My lithium battery died overnight after i left the key in by accident. Lost all my monitors.

Very frustrating!

[yhp2009]

This worked for me on more than one occasion. Had to do it in the dead of night to get it completed without interruption with hazard blinkers on.

[sdmcoupe]

any luck getting the cat readiness set?

[turbosig]

Thanks. No, so far I've noticed the driver door

1. Window doesn't drop when opened nor close up once closed

2. When opened, didn't turn on interior lights.

3. The black nipple stutters and doesn't quite move up and down properly when you press the lock/unlock botton in center console.

The door locks and unlocks with the key just fine, and the window goes up and down auto automatically like it should.

#3 is my biggest clue that it's the actuator I think. Just in my experience of seeing people have issues, the actuator is a problem more often than gm5. I should look into relays too tho I suppose.

It sounds like it might both the actuator and the GM5 or relays. I would email Scott https://www.bmwgm5.com/GM5_Repair_Service.htm your symptoms - he is an expert.

[turbosig]

Did you get the "Cats" read ready? ANy update? I'm in the same predicament at the moment and need to get my car smogged soon.

Not yet unfortunately. I swapped out the TPS sensor by the intake manifold to get rid of the code for that, and then cleared all codes to get rid of that code (TPS) and a pending slight air leak code. This resets all the monitor tests. I have not had the opportunity yet to drive it per the drive cycle steps. But yesterday when I took her out I ran OBDFusion and still see the Cat not ready and now the O2 Sensor Non-Continuous is not ready. All other systems have cleared.

Hoping to be able to drive it more to see if I can clear the Cat and the Non-Continuous O2 sensor. If not, I will be replacing all four O2 sensors. The car is not my daily driver so its hard to get it out to drive the cycle especially here in NJ where there are no stretches of road that can let me do it outside midnight.

[sdmcoupe]

Did you get the "Cats" read ready? ANy update? I'm in the same predicament at the moment and need to get my car smogged soon.

[Tbonem3]

Thanks. No, so far I've noticed the driver door

1. Window doesn't drop when opened nor close up once closed

2. When opened, didn't turn on interior lights.

3. The black nipple stutters and doesn't quite move up and down properly when you press the lock/unlock botton in center console.

The door locks and unlocks with the key just fine, and the window goes up and down auto automatically like it should.

#3 is my biggest clue that it's the actuator I think. Just in my experience of seeing people have issues, the actuator is a problem more often than gm5. I should look into relays too tho I suppose.

[turbosig]

1. Pre cat o2s are most important for performance

2. Passing the cat tests is post cat o2

Change them at around 100k

turbosig - was your problem gm5 or physical actuator?

You're the second person that said its generally the Post Cat sensors for Cat readiness. I think they are the original O2 sensors, so might as well swap all 4.

At first my passenger door wouldn't unlock, just lock and you couldn't open the door from the outside. I replaced the actuator with brand new OEM and that didn't solve. I sent my GM5 to Scott and in his diagnosis, it wasnt the GM5, everything was operating, so he replaced my door lock relays on the GM5 and it worked. So it must've been the door lock relays. You having the same issue?

I attached my O2 logs to see if anyone can help me narrow down which sensors are acting up?

[turbosig]

turbosig, are you on factory or euro headers? My car is in the same boat as yours. After I installed euro headers and cats, my catalyst monitor will never clear. My car does have 168k miles on it and I think they're the original o2 sensors. So I'm thinking about replacing both pre-cat sensors, as those tend to wear out a lot faster than the post-cat ones because they're exposed to a lot more heat.

Factory headers with about 98K. Car is bone stock. I too was thinking the first 2 pre cats, but I think I will swap all four sensors since the subframe will be off anyway. I don't want to drop it again if I replace 2 out of 4 and wind up having to do all 4.