According to my scanner, I'm not passing a few of the tests for emissions. They are: catalyst, evaporative, 02 sensor, and egr. I currently do not have any codes, and I drove my car for about 1.5hrs before checking with the scanner. I also just yesterday replaced one of the 02 sensors (po141 b1s2), and cleaned my EGR/TB about a week ago. What could cause my car to not pass these tests?

 

If you just replaced an O2 yesterday, did you also clear the codes then?

Disconnected the battery recently?

Go perform the drive cycle, problem solved.

 

i just have a question. Maybe its new to me, but what kind of scanner do you have? If your scanner is telling you that your 02 sensor, catalyst, evap, and egr system has something wrong, doesn't that throw a code?? pmohr...am i being an idiot???

I mean, the only thing i can think of that does give you if you're passing is the actual machine that they have in the inspection places. Unless you have that, but even so, that should only be for vehicles that don't have obd ports and are using the tailpipe sensors and what not. i think the code reader is actually reading failures and you actually have codes. With that said, are you SURE that you don't have cel codes?? or that it just says not ready in the scanner is what you're referring to?? i'm a little bit confused right now as i don't believe a regular scanner can tell you if you're going to fail but not throw a code. It seems to me that if the system are all ready and doesn't throw a code, you should pass. I don't know how you are not going to pass and NOT throw a code...

 

Even most of the cheap POS code readers these days can show you the status of the emissions readiness monitors.

 

right, i understand that, but that doesn't mean he's going to fail, it just means it can't be tested cause the system is not ready since he hasn't drive the full cycle for the ecu to detect it again. It doesn't necessarily mean that he WON"T pass because there is something wrong, it just means he WON"T pass cause its NOT ready. Maybe not passing a few of the tests = not ready. I thought it meant he's not going to pass those tests...

 

Regardless, it means that he won't pass emissions, whether it be for OBD-II readiness monitors, or DTCs. That was his question.

But yes, all he needs to do is the drive cycle, I imagine he cleared the codes after replacing the O2 sensor, which would be the issue.

 

that thing is kinda confusing. have you done it before?

 

It's not that bad. You can do it in sections, you don't need to do it all at once.

 

im just dreading doing it.

 

Yes I cleared the codes after changing the sensor, and as of right now, no CEL. Also what kind of drive cycle should I follow? Here's one that I found is this sufficient?

http://www.lyberty.com/car/drive-cycle_maxima.html

 

Looks to be the correct one, yes.

 

As pmohr stated just complete the drive cycle steps and you should be fine. Being from Illinois, a 96-2000 can be tested and have no more than two monitors incomplete and still pass as long as no CEL or codes are stored.

 

How sure are you on this? I remember somebody stating that no more than one of the monitors can be "not ready" in order to pass inspection. I just did the first part, out of two, of the drive cycle and still my catalyst & evap show "not ready" according to my scanner.

Should I try going to emissions? Also my engine was completely warmed up (temp needle on normal) before starting the DC. It says on the DC that coolant temp should be below 70 C/158 F. Should I have started immediately on a cold engine or waited until warmed up?

For section 7 on the DC, am I supposed to be in 4th, release accelerator for 5 sec then put it in neutral and cruise for 1min? Or just put the clutch in for 1min and let it idle?

Also for "Section 8" on the DC, are you supposed to accelerate & decelerate for the whole 2 min? Or how is it supposed to work? Then for the second part of section 8, am I supposed to idle in gear, or just in neutral and cruise to a stop?



Thanks for any help.

 

Here it is from the IL emission site. http://www.epa.state.il.us/air/vim/faq/obd.html#7

Look at Q "How do readiness monitors affect the automotive repair industry." My bro with a 97 passed with two monitors incomplete and I just passed (01) couple weeks ago with one monitor incomplete.

 

Thanks for the info. Went today and passed with 2 monitors incomplete