Infiniti QX4 1999–2000 — technical service bulletin
Bulletin ITB01045A · NHTSA communication 630821 · issued Mar 13, 2002
Technical service bulletin
communication type
Unknown / Other
component
1999–2000
model years
2
vehicle entries
Official summary
Subject regarding malfunction indicator lamp on with rear oxygen sensor diagnostic trouble code po138-p0140 or p0158-p0160 stored. *yh
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.