what does air/fuel ratio code mean and is that a sensor???

1991 TOYOTA COROLLA
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CTMC72
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gentleman called me asked if i could scan his car the check engine light came on saterday, i said i could scanner would not show any codes seen that the check engine light was blinking and wrote the number of times it blinked.
Mar 7, 2012 at 3:00 AM
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FIXITMR
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what was the code #.
Mar 7, 2012 at 3:19 AM
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CTMC72
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It said code 25. it flashed 2 times then 5 times
Mar 7, 2012 at 3:55 AM
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FIXITMR
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running too lean.could be a sensor or vac leak maybe between IAT and throttle body. you have MAP, ECT, IAT, 2 OX sensors.
Mar 7, 2012 at 4:33 AM
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CTMC72
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im not very fimilar with toyota so what is the IAT, ECT sorry if i seem dumb but never fixed one before. and where would the sensor be located??
Mar 7, 2012 at 5:16 AM
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FIXITMR
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take a fuel pressure reading too.
Mar 7, 2012 at 6:03 AM
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