A trip mileage of about 35,000 km of the 2006 GAC Toyota Camry Extreme Edition sedan. Customers reflect car lights lit when driving engine failure .
    After the pick-up : The IT-II to detect and read fault codes , fault code P0171, which means " the system state depopulated ( 1 case ) ." Then IT-II diagnostic trouble code P0171 is detected freeze frame data flow , oxygen sensor signal voltage is found outside the normal range , only 0. 11 V. Fault code and data flow of the air-fuel ratio does not reflect the normal - too lean mixture .
    First remove the oxygen sensor , it was discovered oxygen sensor surface is very dark , and then clean the oxygen sensor mounted on the car , after using IT-II Clear trouble codes and read the data stream to start the engine , the oxygen sensor signal value is still small, lights and engine failure at this time . To determine the oxygen sensor is faulty, then replace the oxygen sensor and clear fault codes, then start the engine and look at the data flow , data recovery to normal air-fuel ratio , engine fault light is not bright .
    Driving road test , after repeated trial , traveling about 80km, engine fault lights and lit, with IT-II detection, fault code is still P0171. Remove the oxygen sensor checked and found the sensor surface and black, which determine the engine system as well as other failures .
    In the test of the . When a fault occurs with no obvious symptoms car , but the engine fault light on the instrument panel lights up in the moment, as attentive listening, can hear a slight leak sound seemed to be coming from the brake booster place, but the vehicle braking performance and no abnormalities.
    Replace the oxygen sensor brake booster and clean , assembled repeated the test, the failure does not occur again.
    After replacing their old oxygen sensor test, the engine fault light immediately lit, indicating that the oxygen sensor is determined to be faulty .
    Troubleshooting: Replace the oxygen sensor and the brake booster .---mvci toyota tis scanner
    Maintenance Summary: the root cause of this failure is the car brake booster vacuum leak , the engine combustion chamber combustible mixture too lean , the oxygen sensor detects the mixture is too thin, so ECU enriched air mixture injection , resulting in oxygen sensor failure.
    Check the brake booster ignored the tightness of the inspection , only to focus on the inspection and replacement of the oxygen sensor , so simply replace the oxygen sensor fault will reappear . Thus, not only when you want to troubleshoot the fault code, data flow analysis , but also with seeing, hearing, do not ignore every detail , only detours, fast and comprehensive troubleshooting.

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