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Old 07-11-2006, 10:58 AM   #1
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PO171 System Lean Bank 1 Code for a 00 Toyota Corolla

Hello: I have my Engine Check Light On for a 2000 Toyota Corolla and I checked with an OBDII scanner and it gives the Code PO 171 Bank 1 System Too Lean. I cleaned the MAF Sensor as it was dirty as I have heard that this code can occur because of the MAF Sensor being dirty. But now when I cleared the Code by disconnecting the Battery, it still comes on. THe gas Mileage has not changed but there is a huge power problem when I start a Cold engine especially when the car is in the parking lot the whole day and its hot outside. Do you think my O2 sensors might be doing this? Please let me know.
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Last edited by amit007; 07-11-2006 at 11:06 AM.
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Old 07-11-2006, 02:24 PM   #2
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did you disconnect the battery for 15mins?
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Old 07-11-2006, 02:51 PM   #3
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Quote:
Originally Posted by amit007
Hello: I have my Engine Check Light On for a 2000 Toyota Corolla and I checked with an OBDII scanner and it gives the Code PO 171 Bank 1 System Too Lean. I cleaned the MAF Sensor as it was dirty as I have heard that this code can occur because of the MAF Sensor being dirty. But now when I cleared the Code by disconnecting the Battery, it still comes on. THe gas Mileage has not changed but there is a huge power problem when I start a Cold engine especially when the car is in the parking lot the whole day and its hot outside. Do you think my O2 sensors might be doing this? Please let me know.
It could be either a MAF or an O2 sensor (in front of the cat). Cleaning the MAF does not always work and sometimes it must be replaced to fix the problem. If the MAF is cheap for your car, I'd change it anyway. If that fails then you likely need to replace the O2 sensor.
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Old 11-04-2006, 12:27 PM   #4
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PO171 Gone, Now its PO420

Thanks for all your help. I had PO171 sometime ago, changed the MAF sensor and the O2 sensor before the catalytic converter. Now I got the Engine Light on again and it says Code PO420. Please help!!!!! Do you think I will have to replace the whole catalytic converter. Any help is appreciated.
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Old 11-04-2006, 12:51 PM   #5
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what o2 sensor did you use ?
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Old 11-04-2006, 02:02 PM   #6
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what o2 sensor did you use ?
Elton, I got a Densco O2 sensor installed. THe light did not go after that. Right after that I had a remanufactured MAF sensor installed and the light went out for about 2 months until it appeared back again.
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Old 11-04-2006, 02:06 PM   #7
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code P0420 Catalyst System Efficiency Below Threshold wich is the o2 sensor you dont have more than one do you ..... also for fun clean the maf and see if that helps
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Old 11-04-2006, 02:10 PM   #8
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code P0420 Catalyst System Efficiency Below Threshold wich is the o2 sensor you dont have more than one do you ..... also for fun clean the maf and see if that helps
Elton: THanks for your prompt reply. I have an O2 sensor before and after a catalytic converter. THe dealer changed the one before the catalytic converter. Do you think the code is because of the sensor After the converter? I will certainly listen to you and clean the MAF sensor. Can this be because of an oil change which I am scheduled to do tomorrow? Your help is really appreciated
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Old 11-04-2006, 03:14 PM   #9
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Originally Posted by amit007 View Post
Elton: THanks for your prompt reply. I have an O2 sensor before and after a catalytic converter. THe dealer changed the one before the catalytic converter. Do you think the code is because of the sensor After the converter? I will certainly listen to you and clean the MAF sensor. Can this be because of an oil change which I am scheduled to do tomorrow? Your help is really appreciated
If you already had the O2 in front of the converter changed, then it would be wise to do the one after because the P0420 may be getting misreported by the rear O2 sensor. You might also see how much a new MAF is, if it isn't too much and replacing the rear O2 sensor doesn't fix it, you might want to replace the MAF. After you have done all of these and the P0420 code remains, I'm afraid you'll need to pony up for a new converter. Just do it in steps and replace one item at a time and resetting the ECU after each.
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Old 11-04-2006, 03:14 PM
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171, 2000, 2001, 2003, bank, catalyst, code, corolla, efficiency, po, po171, scan, system, threshold, toyota

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