Obdii Code 0171
Thread Starter
Lexus Test Driver
Joined: Aug 2006
Posts: 954
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From: NY
Obdii Code 0171
I have check engine sign on my 2000 RX 300 for two weeks. I scaned with Snapon advance scanner and it says code 0171 system too lean Bank # 1.
I read the explanations of this code in the book, it says MAF sensor, Catalyst, Oxygen sensor. One week before I clear the code and the check engine sign gone but came back after a week. Now I change the oxygen sensor on next to engine on top but one day later check engine sign came back. What should I do. Please help me about this.
I read the explanations of this code in the book, it says MAF sensor, Catalyst, Oxygen sensor. One week before I clear the code and the check engine sign gone but came back after a week. Now I change the oxygen sensor on next to engine on top but one day later check engine sign came back. What should I do. Please help me about this.
Last edited by gazi001; Jul 16, 2007 at 11:41 AM.
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
I read the explanations of this code in the book, it says MAF sensor, Catalyst, Oxygen sensor. One week before I clear the code and the check engine sign gone but came back after a week. Now I change the oxygen sensor on next to engine on top but one day later check engine sign came back. What should I do. Please help me about this.
But first get pending codes, I bet they are gonna be one or more of the following:
P1130, P1133, P1135 (Bank 1 A/F Sensor)
P1150, P1153, P1155 (Bank 2 A/F Sensor)
P0100, P0101 (MAF Sensor)
You also might get P0125
Thread Starter
Lexus Test Driver
Joined: Aug 2006
Posts: 954
Likes: 4
From: NY
I have only one code 0171 nothing else. I also cleaned the maf sensor and changed the A/F sensor on bank 1 on the bottom of the engine. But I have the CEL again and the obd code 0171 only.
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
Check again, P0171 never comes alone. You have an OBD-II scanner? If not ask for PENDING codes.
Driver School Candidate
Joined: Aug 2006
Posts: 5
Likes: 0
From: il
clean the maf sensor and check for leaks. i had the same problem last year and i replaced the maf sensor, then two months ago i got P0174
System Too Lean (A/F Lean Malfunction, Bank 2) code i erased it an then the P0171 came back. so i also replaced the O2 sensor after the cat and havent gotten any more codes
System Too Lean (A/F Lean Malfunction, Bank 2) code i erased it an then the P0171 came back. so i also replaced the O2 sensor after the cat and havent gotten any more codes
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Pole Position
Joined: Aug 2005
Posts: 200
Likes: 0
From: Sugarland, Texas
clean your MAF sensor with throttle body cleaner, clean the seals, reinstall, check your accordion bend for cracks(part of the exhaust that bends by the driveshaft[if you have awd]), disconnect the negative terminal for about a minute and drive 100 miles, the time it takes for the computer to register anything. See if that helps. If that doesn't then you could have a faulty O2 sensor.
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Lexus Test Driver
Joined: Aug 2007
Posts: 1,482
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From: NY
Like one of the members said earlier..
Jack ur car up...
Start IT
And check if you have any exhaust leaks...U might need a new gasket..
It's not a major repair if u do need one..
Gasket costs like 10 bux..and install is a DIY..but a shop wud do it too
i buy my maf from autozone because its only $80 and comes with a 1 year warranty.
i even told them i tried cleaning my sensor and broke it. they still let me exchange it for a new one for free.
i even told them i tried cleaning my sensor and broke it. they still let me exchange it for a new one for free.
Driver School Candidate
Joined: Dec 2006
Posts: 31
Likes: 0
From: ca
hi -
this might help you. i have an rx330 and i got the same error code. read my posts.
https://www.clublexus.com/forums/sho...d.php?t=295934
this might help you. i have an rx330 and i got the same error code. read my posts.
https://www.clublexus.com/forums/sho...d.php?t=295934
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