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What is this in my engine bay (Pic)

B-Man

By B-Man,
in General Automotive Discussion

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B-Man Grand Master

B-Man

Posted
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Might be air bag - but why would it be so close to the turbo ??

Knock sensor is attached to the block AFAIK

Oxygen Sensor is attached to the exhaust dump - know that for certain :D

Diagnosis plug in is under the dash AFAIK

OK - Looks like I need to RTFM...... :D

Sneaker Enthusiast

Sneaker

Posted
Posted

This may be it:

The wire going to it is yellow and black striped? And it has a rubber cap that comes off? It is quite possibly and indicator for the timing light. It has been put there to easily check the timing of the car without having to look for an ignition lead.

Now I'm not sure exactly how to hook it up. I assume you give the normal power to the timing light and then hook up the connector to the bit inside.

One thing I can say is that it is not a Knock Sensor. These are found on the inlet side of the engine. Your car would be coming up with fault code 34 (from memory). It is not an O2 Sensor either as this plugs into the exhaust, and we all know what buring plastic smells like!

Nissan, in there infinite wisdom, made all these things with clips on them so they wouldn't run loose in the engine bay. I will try and find where it clips in so you can give it a home. (Somewhere near the strut tower, behind the pwr str tank)

What ever you do, don't get rid of it. It is there for a reason. Just tuck it out of the way for the moment. Should make checking the timing a bit easier.

What do ya think?

The Dan Grand Master

The Dan

Posted
Posted

IT IS NOT A KNOCK SENSOR. IT ISN'T USED FOR TIMING EITHER.

The ignition is close looped so you will find a thin black wire looping out behind the ignition control module. That is what is used to check timing. The plug you have displayed belongs in front of the left tower near the power steer reservoir and AFM. It is of no importance to you whatsoever and is used as an earthing device for diagnostic check. It usually has the plug in it and tape over the plug. I would still seal the wire as you don't want it to earth by mistake and enter a diagnostic mode. I can tell you EXACTLY what is used for if you really want me to but this involves effort and I will only do on request.

Jetdat Veteran

Jetdat

Posted
Posted
Oxygen Sensor is attached to the exhaust dump - know that for certain :)

most of us here know what an oxygen sensor looks like and know where it is.

perhaps i should have explained myself better...i meant it is the plug that is attached to the oxygen sensor perhaps?

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