HELP! I drive a '95 SE and my engine light is on. When I run the diagnosis, it flashes codes 34, and 77. Here's the problem. When I use the diagnosis provided by this site, it tells me that 34 is the "Knock sensor" and 77 is the "Rear heated oxygen sensor." I own the Nissan service manual, and it tells me that 34 is the "Front engine mounting" and 77 is the "A/T signal No. 3." Which one should I go by? I'm confused. Thanx...

 

3 long 4 short = knock sensor
7 long 7 short = rear O2

Your original diagnostic was correct. =)

 

Thanx...but do you know why the NISSAN service manual would say otherwise? My maxima is a '95, and the manual says 1995 on the front. Again, it said 34 was "Front engine mounting" and 77 was "A/T signal No. 3." Any idea why?