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I had the pleasure of driving my girlfriend's 1998 200SX SE-R the past weekend to try and diagnose some of the problems. While I was able to help, the problems are not solved entirely, and in the course of my diagnosis, I noticed something strange.

On the firewall near the brake booster was a little black plastic sensor labelled "Boost" and attached to the intake manifold with a vacuum tube. Obviously being a Honda guy I know a MAP sensor when I see one, and this sucker is definitely a MAP sensor.

So why does the B14 chassis have both a MAF sensor and a MAP sensor? I tried unplugging it and got no codes, so I doubt the ECU is even looking at it. I know for a fact the ECU code that interprets MAP signals are very different from the code to interpret a MAF... so why is it there?
 

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Just for fine tuning, also used as part of the OBD2 functions to know what vacuum the engine is at , uses that to monitor EGR, Evap. as wel as other functions ....
 
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