what do you make of this code ..p0422-main catalyst below threshold
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From: BEAUFORT SC
what do you make of this code ..p0422-main catalyst below threshold
JUST SOME STUFF I FOUND ON LINE TRYING TO FIGURE IT OUT...
An improved method of assessing the catalyst warm-up rate of a motor
vehicle catalytic converter is based on the response rates of fast warm-up
exhaust gas sensors located in the exhaust gas upstream and downstream of
the catalytic converter. The method essentially measures an oxygen storage
characteristic of the catalyst that increases as the catalyst temperature
rises to its ideal operating temperature. In one method, a ratio of
switching frequency between the upstream and downstream exhaust gas
sensors is periodically computed and compared to a threshold during
catalyst warm-up. In another method, the response times of the exhaust gas
sensors to a known air/fuel ratio transition are detected to form a
measure of the oxygen storage characteristic that is compared to a
threshold. In each method, the threshold varies as a function of
cumulative airflow through the engine to compensate for different engine
airflow levels.
GOT THE 3"DP.....THE LIGHT CAME UP AFTER INSTALLING 4 BAR FPR AND BM
BM WAS SET TO 1 TURN AND 4 TURNS. 19 PSI BOOST
An improved method of assessing the catalyst warm-up rate of a motor
vehicle catalytic converter is based on the response rates of fast warm-up
exhaust gas sensors located in the exhaust gas upstream and downstream of
the catalytic converter. The method essentially measures an oxygen storage
characteristic of the catalyst that increases as the catalyst temperature
rises to its ideal operating temperature. In one method, a ratio of
switching frequency between the upstream and downstream exhaust gas
sensors is periodically computed and compared to a threshold during
catalyst warm-up. In another method, the response times of the exhaust gas
sensors to a known air/fuel ratio transition are detected to form a
measure of the oxygen storage characteristic that is compared to a
threshold. In each method, the threshold varies as a function of
cumulative airflow through the engine to compensate for different engine
airflow levels.
GOT THE 3"DP.....THE LIGHT CAME UP AFTER INSTALLING 4 BAR FPR AND BM
BM WAS SET TO 1 TURN AND 4 TURNS. 19 PSI BOOST
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