Hey guys. I have a 07 tls and it seems like if I leave my car idling for more than 10mins the cel comes on. It's done it twice so far. It still runs fine and gives no issue. I find it kinda odd.
P0171 and P0174 are what came up the first time. 3/2/13

And just p0174 is what came up yesterday.
The system 2 lean bank 2. BS.

Anyone have this issue?

 

check the o2 sensors and make sure they are plugged in correctly and not loose. I had those codes come up when I installed my precat deletes and all I did was tamper with the o2 sensors and reset the code and the light never came back on since than. It's been almost a year now.

 

How many miles ??

 

Oh ok, and it has 107k

 

Looks like O2 sensors, those are a pain in the ass to replace!

 

Same codes popped up on my tl-s. Did it twice after a cold start. Took to the dealer and they suspected valve lash and told me it needed a valve adjustment. I was sceptical since I only have 62000 miles on it. I had them do the adjustment and haven't seen the codes since. I also noticed the valves don't make as much noise as they did before the adjustment. Didn't notice the valve noise until after the adjustment, it runs smooth with no ticking noises anymore.
Hope this helps.

 

It's not the o2, lean codes are easy to figure out if your o2 is working. Start the car, and bring up your o2 pid in a scan tools live data list. Add propane to the throttle body while running and see if the o2 goes rich. If so it's more than likely not the o2. I've had issues in the north east where fuel contamination (the additives and stabilizers) that gas company's put in there gas cause lean codes. Run through your tank and the try using top tier gas, shell vpower treats me well.

 

i had those same codes pop out on me it turn out to be the gasoline and im at 174k try to pump gas somewere else and reset the codes

 

Hasn't came back on since. I don't leave to car idling longer than 5-10 mins anymore though.

Thanks guys!