Codes 43 and 64?!
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 3,218
Likes: 47
From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
Codes 43 and 64?!
Hi everyone. My car is giving me problems. 
When it is idleing in the garage it sounds / runs fine. When I drive it, it sounds very loud and horrible. It is backfiring like crazy. I jumped the codes and got a 43 and a 64. So, these tell me that I had a problem with either the knock sensor and/or the O2 sensor. Right?
Could this cause the problem I am describing?
Where do I start?
Help!!
Thanks,
-Rick
When it is idleing in the garage it sounds / runs fine. When I drive it, it sounds very loud and horrible. It is backfiring like crazy. I jumped the codes and got a 43 and a 64. So, these tell me that I had a problem with either the knock sensor and/or the O2 sensor. Right? Could this cause the problem I am describing?
Where do I start?Help!!
Thanks,
-Rick
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 3,218
Likes: 47
From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 3,218
Likes: 47
From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
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Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
Throwing parts at a problem without diagnosis is like playing the lottery. You may get lucky, but you also may just wind up a little poorer.
I have the '92 FSM and can post pages from it if helpful.
I have the '92 FSM and can post pages from it if helpful.
but normal maintenance is not throwing parts at it
Team Owner
Joined: Sep 2003
Posts: 25,360
Likes: 2,729
This says that poster "larry_c4" needs to do some diagnostics and maybe explain further his circumstances.
You've "assumed" again to CYA but the post count is + another 1. How did you determine your thoughts were "normal maintenance"?
A genuine offer of assistance
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
This is a forum that folks come for help and opinions this is mine do what you want and let us know. I always want to know what the fix was always learning.
If you don't agree with it then put yours in to help. Bitching about it is fine if it helps you in some way.
Sure getting proper diagnosis is always best and reading the book will do this.
I chose to try to help sometimes I get lucky. Some just tell you to read the book thier choice.
Some do not have the tools or knowledge.
Some do not want to pay hundreds of dollars to have it done.
I could not care less about thread count. Are there prizes that I don't know about? LMAO
If you don't agree with it then put yours in to help. Bitching about it is fine if it helps you in some way.
Sure getting proper diagnosis is always best and reading the book will do this.
I chose to try to help sometimes I get lucky. Some just tell you to read the book thier choice.
Some do not have the tools or knowledge.
Some do not want to pay hundreds of dollars to have it done.
I could not care less about thread count. Are there prizes that I don't know about? LMAO
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
This says that poster "larry_c4" needs to do some diagnostics and maybe explain further his circumstances.
You're "assuming" but your post count is +1
You've "assumed" again to CYA but the post count is + another 1. How did you determine your thoughts were "normal maintenance"?
A genuine offer of assistance
You're "assuming" but your post count is +1
You've "assumed" again to CYA but the post count is + another 1. How did you determine your thoughts were "normal maintenance"?
A genuine offer of assistance
Nice commentary but no helpful information to help OP. You seem to have a vast collection of books. Use them to help would be great.
ing around to bitch about my suggestions do not help the OP. I use my years of working on cars and thirty plus years building them in the factory to try to help. I cannot see from here so just guessing. If you like following me around and bitching feel free if it gives you enjoyment.
Intermediate
Joined: May 2015
Posts: 45
Likes: 1
From: Philadelphia PA
I used the paper clip to pull codes via the digital dash and now got 3 codes, H42, H43, H64. I cleared them all out of the ecm via dash. I have been driving it and it seemed to be running good for the first two days (after clearing the codes) But...today the SES light came on and I immediately checked for codes. Just as I thought, a H64 (Oxygen sensor) and no other codes present. This tells me that the oxygen sensor(s) are Causing the knock sensor code (43) over time. I think by replacing the O2 sensor, the knock codes won't re-appear.
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
I used the paper clip to pull codes via the digital dash and now got 3 codes, H42, H43, H64. I cleared them all out of the ecm via dash. I have been driving it and it seemed to be running good for the first two days (after clearing the codes) But...today the SES light came on and I immediately checked for codes. Just as I thought, a H64 (Oxygen sensor) and no other codes present. This tells me that the oxygen sensor(s) are Causing the knock sensor code (43) over time. I think by replacing the O2 sensor, the knock codes won't re-appear.
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
Racer
Joined: May 2009
Posts: 261
Likes: 2
From: Boise Idaho
Nice commentary but no helpful information to help OP. You seem to have a vast collection of books. Use them to help would be great. ing around to bitch about my suggestions do not help the OP. I use my years of working on cars and thirty plus years building them in the factory to try to help. I cannot see from here so just guessing. If you like following me around and bitching feel free if it gives you enjoyment.
ing around to bitch about my suggestions do not help the OP. I use my years of working on cars and thirty plus years building them in the factory to try to help. I cannot see from here so just guessing. If you like following me around and bitching feel free if it gives you enjoyment.
Intermediate
Joined: May 2015
Posts: 45
Likes: 1
From: Philadelphia PA
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
I think your right on yours mine has three but they were setting up for ob2 in 94. Get the o2 socket from Oriely's for $20 deposit use the short one pass side is a bit harder.I did the knocks and fuel filter since I was under there but that's just me.