DTC Description

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ECM shows P2237 when the conditions are like below.

Deviation of average correction value of fuel ratio is higher than 0.1 when sensor voltage is 1.49~1.5V.
Accumulated air mass flow value is higher than threshold value when target lambda is 0.97.
Upstream O2 sensor displays 1.7V below when the fuel cut is being kept over 3 minutes.