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H4: Check For O2 Sensor Failure

With the conditions held as H3, suddenly decelerate to idle

Fig 1: Checking For O2 Sensor Failure (With Conditions Held as H3)
Courtesy of JAGUAR CARS, INC.
- Has the voltage dropped to 400mV or less ?
Yes : Stop the engine

GO to H5

No : Renew O2 sensor; reconnect plug(s)

GO to H7