knock sensor??

does anyone know what is involved in changing the number 2 knock sensor, mine is bad, and have not even lookd for it yet....is it a bad job??

[Beav]

All you need to do is use the search box...

http://www.subaru-svx.net/forum/show...&threadid=1804

sorry

[Beav]

No problemo!

i checked out the thread, can i get clarification on which side is the #2 sensor????

[Beav]

It makes no differnece really, both should be changed at the same time. Where are you getting a reference to #2 sensor?

[Beav]

While I'm thinking of it, most times when a scanner, etc. refers to #1 and #2 you need to see which bank of cylinders is the leading bank - in other words which bank is #1 spark plug on? It would be sensor #1 and the opposite bank would be ....drum roll please....sensor #2.

suby dealer said one o2 sensor was bad, but both should be replaced, in pairs, but they said the # 2 was bad, and they do not need to be replaced in pairs, they stated that, unlike o2, which should always be replaced in pairs, a knock sensor, can be done indvidually... because, they work with a "one trace" resistence factor, where as the o2, are different...i didnt know what to say when they said that...except...um, ok thanks!! lol

[Beav]

Personally I agree with replacing both O2 sensors at the same time and I could live with one knock sensor at a time - but not for the reasons they gave you. With the O2 sensors it's more of an age/balance thing. O2 sensors are like us, the older they get the less active they are. Each forward sensor controls its respective bank of injectors, so when it gets old and sluggish its bank of injectors isn't operating at the same peak efficiency as the bank with the new O2 sensor.

Knock sensors, on the other hand, operate like the push-button ignitor on a gas grill. A little pressure or vibration and they generate a small voltage that's sent to the computer. They operate in a go/no-go world, either they work or they don't. However when one bites the dust the other probably will soon follow suit. My recommendation to replace both was based on the factory manual that states that they should be replaced in pairs.

[Trevor]

Beav, I love the post scripts appending your signature, they often light up my day. Where do you get them from? If they are original you are aven brighter than I thought!

Keep it up, Trevor.

[Beav]

I've a rather large family and I pluck favorites from their e-mails, etc. I only wish I had the time to dream up some of my own, or at least some that are postworthy...

[Trevor]

Beav, even though they are not original you go to the trouble of selecting them and posting them and for this you have my thanks and I am sure many others. Special good wishes, Trevor.

[Roger8519]

i just had mine replaced 2 days ago. cost me $165. the part is only 70 though

my CHECK ENGINE light came on a few days ago and they told me it was my Knock sensors so they replaced both costing me a little over a 100 for both sensors and 180!!(3 hours) FOR LABOR totaling nearly 300 dollars. how long do you think it really would take to diagnose the problem and change both knock sensors?

[Beav]

From the book:
Knock Sensor
. Replace . .
. . MPFI .
Warr. Std.
1.9 2.7
Notes
. . . Includes: Troubleshoot And Replace Each Component.

Since I doubt it was a warranty repair, multiply the shop rate by 2.7 hours and toss in the price of the sensors.

However, if you really want to press the issue, there was a TSB issued with revised procedures and labor times as such:

Subaru TSB 11-46-95

Applicability: 1992-1995 SVX 3.3L

FAILURE CODE OPERATION # LABOR DESCRIPTION LABOR TIME

KNOCK SENSOR A145-581 KNOCK SENSOR BOTH-REPLACE 0.7
UEA-48 (INCLUDES ACCESSING DTC
USING SELECT MONITOR)

Note :Refer to revised 1992-1995 SVX 3.3L knock sensor replacement information on the reverse side.

This shows replacing both sensors in .7 hour. Might be worth pursuing. Good Luck!