rcop3 Posted May 15, 2007 Share Posted May 15, 2007 I have a '00 RX300, just hit 100K. Code P0171 (bank 1 too lean) came on recently. Cleaned the MAF Sensor, light stayed off about 200 miles and came back on with same code. There are a lot of posts about this code, and they all say that the problem is either the bank 1 sensor 1 (O2 sensor, P/N 89467-48011) or the MAF Sensor (P/N 22204-07010). Before I randomly guess and purchase one of the two, anyone have more insight on how I could pinpoint which one is the problem? The other suggestion I read was to try fuel injector cleaner, which I tried to no avail. Any help would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
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