chilton auto repair manual available free at your local public library. vid i have a 2001 Sienna with the check engine light on. had a diagostic machine check and got a code P0171 AND P0174. And it says "system too lean". Also it the diagnostic reads: O2S212 .625 mv O2S211 3.29 mv your info will be greatly appreciated. po 171 is almost always the mass airflow sensor located in the air cleaner box. start with that, its only about 150.00 for the part and is easy to replace. I took MAF off the top of the air filter with two screws and clean it and reset the check engine with ODBII code reader I called Toyota dealer in Canada it cost $245 plus tax
P0171 specifically for Toyota is generic "too lean", and very well could be MAF, but the MAF can be cleaned, recommend trying aerosol cleaner before buying a new one, and run the OBD again to see if it will give you a more specific fault code..it could be O2 sensor, MAP Intake (Manifold Absolute Pressure) and dozens of other things. No dispute here, just adding
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When the light comes on it's telling you to read the engine diagnostic codes.
Go on the web and goggle it. (TOYOTA CODES)
Engine cylinders # 1 and # 4 are misfiring
Trouble code P0172 means: System Too Rich (Bank 1)
Troublcodes.net Trouble Codes OBD & OBD2 Trouble Codes and Technical info & Tool Store. By BAT Auto Technical
Trouble code P0150 means:O2 sensor circuit malfunction (Bank 2 Sensor 1)
may be this website may help: plusobd.com/
The primary cause for no diagnostic reading to be available on a 2001 Cavalier is a faulty connection or code reader. The computer is designed to automatically transmit codes once an ODBII code reader is connected to the port.
Trouble code P0153 means:O2 sensor circuit slow response (Bank 2 Sensor 1)
A full listing of diagnostic codes can be obtained from most General Motors dealerships. The Chevy Lumina has more than 500 diagnostic codes.
The average Nissan automobile has more than 400 diagnostic troubleshooting codes. You can obtain a complete list of diagnostic codes from most Nissan dealerships.
Diagnostic Trouble Codes.