Check Engine On Again

Hi!! Everyone, I Hope Someone Can Help Me With This Problem. Ok My Check Engine Lite Came On I Checked To Codes And It Said That (bank 1 Was Too Lean). What Does That Mean? What Do You Need To Replace? I Hope Someone Know Whats Wrong.

Usually if its just 1 bank running lean... your passenger side Oxygen Sensor is possibly going bad. Bank 1 points to right side or passenger side.... bank 2 points to drivers or left side... so if your code reads bank 1 to lean look into Oxygen Sensor.

It could possibly be the O2 sensor, or it could be the MAF sensor. I currently have the same code on my computer. And i was told by a thunderbird guy to replace the MAF and that will solve the problem. I'll post back with my results

Hi!! Everyone, I Hope Someone Can Help Me With This Problem. Ok My Check Engine Lite Came On I Checked To Codes And It Said That (bank 1 Was Too Lean). What Does That Mean? What Do You Need To Replace? I Hope Someone Know Whats Wrong.
YOU WHERE RIGHT, IT WAS THE PASSENGER SIDE O2 SENSER. I REPLACED IT WITH A NEW ONE, SCANDED FOR CODES AND FOUND NOTHING. THANKS FOR YOU HELP!!!

It takes eight drive cycles for the code to come back on. If it comes back on you may have a vacuum leak around the intake pulling to much air in that bank. Also if you've been using a cheap air filter (i.e. fram) those will screw up your air flow sensor.

you Where Right, It Was The Passenger Side O2 Senser. I Replaced It With A New One, Scanded For Codes And Found Nothing. Thanks For You Help!!!
You Where Right The Cel Can On After About 8 Start Cycles. I'll Check For Vacuum Leaks And Also The Air Cleaner.

You don't have a miss, do you? Usually one bank being lean indicates an O2 sensor or a miss. Usually if you have a vacuum leak or bad MAF sensor, both banks read lean. A miss or a clogged injector will cause one bank, though.

when i had that code on my old 94 it was the o2 sensor so u need to check that if it is not missing like yoter said

You Where Right The Cel Can On After About 8 Start Cycles. I'll Check For Vacuum Leaks And Also The Air Cleaner.
THE CHECK ENGINE LIGHT FINALLY STAYED OFF AFTER REPLACING THE MAF. NOW ANOTHER PROBLEM CAME UP. THE CAR FEELS LIKE ITS HESITATING AFTER I TAKE OFF. OR A BETTER WAY TO PUT IT WHEN I IDLE ON DRIVE. I ALSO WENT AND HAD IT SMOG AND DIDN'T PASS. THE REPORT SAID THE HC (PPM) AND THE CO (%) WERE WAY
HIGH. ANYBODY HAVE ANY IDEA WHAT COULD BE CAUSING THE PROBLEM?

You Where Right The Cel Can On After About 8 Start Cycles. I'll Check For Vacuum Leaks And Also The Air Cleaner.
THE CHECK ENGINE LIGHT FINALLY STAYED OFF AFTER REPLACING THE MAF. NOW ANOTHER PROBLEM CAME UP. THE CAR FEELS LIKE ITS HESITATING AFTER I TAKE OFF. OR A BETTER WAY TO PUT IT WHEN I IDLE ON DRIVE MORE. I ALSO WENT AND HAD IT SMOG AND DIDN'T PASS. THE REPORT SAID THE HC (PPM) AND THE CO (%) WERE WAY
HIGH. ANYBODY HAVE ANY IDEA WHAT COULD BE CAUSING THE PROBLEM?