DTC 25

CODE 25 - AIR/FUEL RATIO LEAN MALFUNCTION

Circuit Description

The main oxygen sensor is located in the exhaust manifold.

It indirectly determines whether the fuel mixture is rich or lean by detecting the concentration of oxygen present in the exhaust gas.




Detecting Condition




Trouble Code Detection Driving Pattern

Purpose of the driving pattern.

(a) To simulate diagnostic trouble code detecting condition after diagnostic trouble code is recorded.
(b) To check that the malfunction is corrected when the repair is completed confirming that diagnostic trouble code is no longer detected.




Diagnostic Chart




Wiring Diagram

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Inspection Procedure