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Oxygen Sensors
Mercury Grand Marquis
Pontiac Grand Prix
Grand Am SE

Where is the oxygen sensor on a 1996 Mercury Grand Marquis 4.6L?

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2006-08-09 10:18:32
2006-08-09 10:18:32

On a 1996 Grand Marquis there are 4 oxygen sensors. 2 (1 on each bank) are mounted before the front catalysts near the manifold-->cat-pipe flange. These are the HEGOS or Heated Exhaust Gas Oxygen Sensor. These are the primary o2s and are what help the PCM determine the correct A/F ratio. There are another 2 directly after the fisrt set (1 on each bank) of catalysts moutned on the exhaust piping between the two catalysts on each bank. The primary goal of these is to monitor the catalysts' effieceincy. In summary: 4 o2 sensors in all 2 are the upstream/HEGOS o2s 2 the downstream o2s 4 cat-convertors in all

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