Question about Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
90% of the Time..Code 1171 is an 02 sensor. Other 5% Is a Mass Airflow Sensor.. And Last .. Fuel Pump.. If engine seems to run fine.. its an O2 sensor.. Thank you
Posted on Mar 12, 2009
Most of the time a lean condition is a vacuum leak! The O2 sensors are doing exactly what they are supposed to be doing.
A car is like algebra nowadays- The MAF and other sensors tell the computer that the car has "X" air coming in. The Computer then adds "Y" amount of Fuel based on reading "X" Then the O2 sensors read what comes out the other end and it should be for example "Z".
When a vacuum leak occurs you end up intruducing more air than the sensors are saying is in there. So the "Z" value is different.
Then POP goes the engine light on.
I would look for a vacuum leak on a lean condition before I started changing Fuel filters.
Posted on Jan 27, 2010
Hello, i have the same car 1999 saab 93 and i am having the same problems. P1171, P0171 , P0300, I had it at the saab dealer and NOTHING. When i come to a stop she starts to shut down. I just paid $500 for DI cassete and thats not fixing the problem. YOU ever found out what yours was? And what fixed it??????
Posted on Jun 16, 2010
Buy a can of Mass Air Flow cleaner. Clean your air flow meter which is attatched to the air box. If you have access to a scan tool look at the live data and under Mass Air Flow it should read 14kg/h. If it is at 16 to 20kg/h it is too high. If your tool reads g/s it should be around 3.75g/s to 4.00g/s. I chased this problem for weeks trying everything.
Posted on Jun 29, 2011
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