G.S.Manios

Hi All,
I got an check engine light and it says left and right banks are running lean?

Optionman1

Post more info.. Can you clear the codes and see if they return?

G.S.Manios

I cleared the codes but haven't driven car yet. Taking it out tomorrow. Let you Know then. I added fuel system cleaner , could that be the cause?

Optionman1

Drive it, see what codes, if any, resurface. Other more qualified RL members will most likely comment soon.

G.S.Manios

Ok. Thanks

Petza914

Most likely a vacuum leak allowing unmetered air in downstream of the MAF or a failing high pressure fuel pump. Smoke test for a vacuum leak.

G.S.Manios

Engine light didn't come back on but "!" was still showing? Scan reading P0171, 0174

Petza914

Once you move the stalk after a warning message, it clears the message but leaves the exclamation point so you know there's an error code. Using the stalk you can go back to review the code message again.

Optionman1

If he cleared the codes I wouldn't expect the ! to stay illuminated. Am I wrong?

Petza914

That correct until it tripped a new CEL, then he'd get the dash message again and once he moved the stalk it would go away and leave the exclamation point. I shouldn't have used the word "clear" in my previous note as I meant used the stalk to change what the dash display screen is showing, not actually that he erased the fault memory with a scan tool.

G.S.Manios

All codes are clear and nothing has come back so far.
Thanks

Optionman1

Good to hear. Keep driving it, its good for both you and the car!

G.S.Manios

Absolutely!! Thanks again

G.S.Manios

Engine light showing again..but the car is running greatQuestion

G.S.Manios

Oil cap wasn't secured. Running great now!