i reset 02 and k/s codes and have yet to replace either. Now i get an 0505 ( no problem code ) which comes right back on after i reset it. Just a few seconds after ignition, it comes back on. Does this require a dealer electronic reset or what?

 

if everything is ok you get 0505 which is good

i dont understand your question

 

i get the 0505, reset to no engine light, start the car and then, very soon, the engine light comes back on with a new 0505 code.

 

Weird, maybe you are not resetting it properly. The reset procedure is not that clear. No you do not need a dealer to reset. Are you sure you are not getting any other codes?

 

i had reset the 0901 and k/s codes a couple of times, but now i am just getting the 0505 coming back on immediately after the reset. Normally it takes a couple hundred km's before the o2 sensor will come back but this 0505 is immediate.

 

and you're getting a CEL?

 

the 0505 repeats immediately after a reset. I reset to a solid engine light, turn the ignition off and back on to a no engine light, start the car and in a few moments the solid lamp is back on and when then i engage the ecu, the 0505 code is back.

 

When you engage the ECU?....you mean when you check for codes you only get the 0505?

From what i know of these cars, if you self-diagnose the ECU and you get the 0505 code, it means that you have no issues with the car. Now if you have the Check Engine Light comming on, and the only code you can pull is an 0505, then thats a different story.

 

its either he isnt resetting the comp correctly or the problem isnt fixed.

 

i have ks and right bank 02 just arrived, but not installed yet. I had reset those codes a couple of times, but, they would take a while before coming back up. The 0505 is more recent, this past time after i rotated the ecu screw, I got the 0505 again, but rather than reset it with the ecu, took the key right out and when i returned to start it, the 0505 was gone all by itself. Hopefully,after the 02 and ks are installed, it will all be good.

 

hmm i got that 0505 code after i did my 00vi swap. So the ecu is telling me i did the swap right? right? J\K anyways! Did you try unhooking the ground to the battery for a while to reset ecu?

 

anyone got any tips on changing the Knock sensor. Everyone so far says get a 10 yr old kid with small hands, but i have to do it myself.

 

If you're right handed (as I am), stand over the passenger fender and use your LEFT hand to squeeze through. (Assuming your left hand is smaller) Also, I just recently read that it's easier to remove the bolt on the knock sensor if the engine is cold. I warmed mine up before I changed mine and it was a PITA to get the bolt loose.

 

I know it is a 12mm, but what kind of wrench? closed, open end or ratchet? what length?

 

I used a craftsman 1/8 inch rachet about 5 inches in length, and was able to get it loose, but I kinda have small hands...I can barely palm a basketball.

 

What happened to this thread? It's like a soap opera ,it just suddenly changed dramatically.

 

the thread started with an 0505 code that wouldn't go away, then into removing/changing a knock sensor. Other than unplugging that little connector at the entrance to the k/s cave, do you have any tips on the procedure. i.e. is it necessary to remove the airflow assembly? is a short ratchet best?

 

ok this thread still confuses me, please draw a line from point A to point B for me will ya ?

1) you one day wake up and get a CEL and check the codes and its for KS and o2
2) you reset the codes using the screw on the ECU and now you get 0505 but no other codes?

Why would you reset the codes before fixing the problem ?
If you replaces the o2 and KS THEN reset the codes and stil lgot a CEL for those same components you replaced then you are not clearing the codes correctly....

If you replaced the components, CEL went AWAY after you reset the ecu, and now you check for codes again and get 0505 then you are FINE, 0505 is ALWAYS THERE until the ECU detects a problem.

0505=Everything is OK!

so your CEL is it on now ? and if so for what code ?

geees this thread is like a world war two picture puzzle grrrr

 

I reset the 0901 code to see if it was a false read, possibly correct itself and just to see how long/many miles it would be before it came on again. then it came on with the ks code so i reset the ksu while i waited for the parts to come in in the mail. then i started getting 0505 code and would reset it only to have it come back on very shortly after. then today, after reading a 0505 code, rather than resetting it, i removed the key and when i restarted a half hour later, the 0505 was gone without my resetting the ecu. on the list of codes that I have 0505 means everything is ok. i have removed the wire connector on the block mount leading into where the ksu is to see if my hand would fit or how to get a wrench in there which may have set off an ecu read after replugging it. the car runs great, just passed an emissions test with the faulty right bank 02 and when i finally get the o2 and ks in, i expect better mileage and performance.

 

So why does the fsm on page EC-3 define 0505 as : No Self-diagnostic failure indicated ?

0505 does NOT set off the CEL and it does not indicate an electrical problem, at least not in my 97 FSM

 

Use an OBD-II scanner, find out the problems, search the forum to find out how to fix them, and fix the problems. That will effectively turn off your CEL. Thread = done.

 

I have not replaced the knock sensor yet as I am trying to determine if i can do it myself.

I am suggesting that my uncoupling the electronic connector blocking the entrance to the ks cave and then putting it back together, may have set off an 0505 code.

 

0505 does set off the CEL. (I deleted my previous posts) It means no errors found, but there is usually an underlying problem that sets the light off. using an OBDII scanner will make no difference. Change the knock sensor.

 

i dont know why 0505 came of with those faulty components, no unplugging that green connector and plugging it back it will not set any codes off, unless you proceeded to start the car while it was disconnected

2da mizzax; the only experience i have with 0505 is when i had a bad KS, i replaced it, reset the ECU, took out the key, put it back in, checked for codes and got 0505...since then i have not had my CEL on...i think if i was to check the codes now it would flash 0505 since there is no failure, i dont want to do that cause im lazy hehe, but you may be right that it shows right after clearing a failure code (such as 0304 for KS)... i just dont have a way of verifying that right now

yes you can replace the KS yourself if your hand is small enough, or get someone else with a small hand... this is what i used to get the bolt on/off the KS

 

I have the same problem. My cel comes on, and when i check it, it will sometimes show the 0302 egr. I have been lazy on cleaning that, but after i reset it, it will come back on 0505. I reset it again, then later the cel comes back on and the 0505 is what i read. Its the weirdest thing. Sometimes it says 0302, other times it shows 0505. Its like the ecu is going bad or something.

 

Who's the one that's bad? Just clean it and that light won't bother you again.

 

why do people think resetting the CEL will magically make the problem go away and then are amazed when it comes back?

 

It's the ostrich approach, if you put your head in the ground, your enemy can't see you.

 

Im getting around to it. Still doesnt answer the question about the cel coming on and reading 0505. It shouldnt do that!!!!

 

It means that there's a ghost code tripping the light. So when you diagnose it, it comes up 0505. Just fix it.

 

Weird. I'm thinking about just replacing the pipe instead of just cleaning it. Thanks

 

 

Doesn't seem like anyone has given a straight answer here... I have a 97 Maxima as well and every now and again my CEL light pops on and when I check the code its 0505. I have had the car for two years now, I'd say it has happened 4 or 5 times and that has been the only code. Its previous owner had changed the KS and one of the O2 sensors a year before I purchased it. So if it really is a 'ghost code' meaning there is some underlying problem, then how the hell are you supposed to diagnose what the REAL problem is???