Thanks again. I did realize that to begin with, which is why I undertook this repair (which isn't my first), but knowing that I can get help if things don't go as planned is most certainly a comfort. I'm no stranger to opening up and repairing things, but cars are more of a challenge for me, partly ...

All of my issues are gone, the smog check passed and my registration has just been renewed. I'm updating this for the sake of completeness and in case it helps anyone out. First of all, replacing the thermostat and coolant temperature sensor DID solve the P0116 code. The check engine light hasn't co...

Great news: I'm an idiot! I looked over everything that you guys recommended and found no leaks. Then, just before I was about to close the hood and book a shop appointment, I took one more look at the thermostat housing and saw a little coolant behind it. I originally said that the housing wasn't l...

Thanks, both of you. I'll check all of that, though I'm starting to think that I'm getting in over my head. Speaking of the coolant level sensor, I ran the car while the coolant reservoir was empty and I didn't get the Coolant Level Low indicator on my dash (which does light, along with the rest of ...

Uh oh. I checked the coolant reservoir today and it was completely empty. It's definitely leaking (I can see it under the car), but it's not leaking from the thermostat housing or hoses that I messed with when I replaced the thermostat and coolant temperature sensor. It appears to be leaking from be...

Thanks for the reply, abscate. That mostly answers that question. I might try calling the station and asking if I can still pass with the CEL on, but I wasn't sure that they would be willing to answer, since stations haven't been willing to divulge why I failed in the past. Yeah, the Federal guidanc...

Thanks again. Yeah, I realize that the reservoir should have only a small part of the total coolant, which is why I was concerned that a majority was still sitting in it. I just checked the level after 5 hours (of the car just sitting) and it was noticeably lower, though, so I feel a better now. I'l...

Thanks for taking the time, Neil. I'm in Nashville, Tennessee, in one of the few counties (Sumner) that requires smog checks (just my luck). As for whether the readiness monitors reset when the codes are reset, I think that they do because the app that I'm using (OBD Auto Doctor on Windows 10 Mobile...

Hi, everyone. First of all, thanks for all of the great information here. I've successfully used it several times over the years, even though I don't post much. I've been failing smog checks on my 1997 850 GLT, so I checked the codes and was getting the common P0116. Partly thanks to past posts here...

What did you read? A friendly fellow with a quirky sense of humor ( I mean, C'mon! It's in his handle! ) answers your question In Depth and then provides several links in an effort to help you out is a Bad Guy? Really? Obviously the useful info was some kinda jab... :roll: Give the Swede some love,...