[Angel9]

Sensor Timing error
(typically a damaged
sensor).

1. Sensor overheating.
(The Bosch LSU4.2 is rated
to operate at a sensor
housing temperature of < 900
degrees (measured at the
bung) for maximum accuracy
and control. When this
operating temperature range
is exceeded, the sensor can
no longer be accurately
controlled. )
2. Sensor is damaged

1. a. Perform sensor heater
recalibration; b. Move your
sensor bung as far
downstream as possible. Right
before the cat, or 2-3 feet from
the end of the tailpipe are good
locations; c. Add a heatsink to
isolate the sensor from the
pipe. The HBX-1 is an
available accessory.
2. Replace sensor.