H64 in the 4.1 module
Thread Starter
Instructor
Joined: Jul 2004
Posts: 210
Likes: 0
From: Lakewood CO
H64 in the 4.1 module
I'm getting an H64 - Right side O2 sensor lean - on my '92 M6 with 110k on it. I replaced both original O2 sensors last weekend and reset the code but it came back the past 3 days. My SES will light about twice during my 25 mile commute at various times.
Any thoughts on why I still have this code showing up?
Dave
Any thoughts on why I still have this code showing up?
Dave
Thread Starter
Instructor
Joined: Jul 2004
Posts: 210
Likes: 0
From: Lakewood CO
I did buy and install Bosch O2 sensors. Why would they be the problem? I've used the same part number on other GM vehicles before without problems.
I replaced the fuel injectors (original) about 6k ago with the Ford pink tops, at the same time I replaced the fuel filter (also original). I started getting poor fuel economy a couple of months ago when the H64 would pop up from time to time.
I haven't checked the fuel pressure. Beyond that, what other fuel related problems could cause a rich condition?
Dave
I replaced the fuel injectors (original) about 6k ago with the Ford pink tops, at the same time I replaced the fuel filter (also original). I started getting poor fuel economy a couple of months ago when the H64 would pop up from time to time.
I haven't checked the fuel pressure. Beyond that, what other fuel related problems could cause a rich condition?
Dave
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
I went through a batch of Bosch O2 sensors this past spring. To start with, the "original" Bosch O2's were in there about a year when the codes started to pop... I replaced both (as I always do, if one is failing, the other isn't far behind). Then one of the new ones failed within about 30 about days... I replaced it... and then the replacement failed!!! I replaced it and the other one failed!!! ****!!!! I replaced both with Denso and have had zero problems.
I just don't have the warm fuzzy w/Bosch that I used to have.
I just don't have the warm fuzzy w/Bosch that I used to have.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
I've used Bosch in the past with out problems, not to say they won't/shouldn't do it. Do you have an exhaust lean before the O2 sensor? Any extra O2 entering the exhaust stream will cause a lean condition.
Last edited by RRT vette; Oct 5, 2006 at 03:58 PM.
Thread Starter
Instructor
Joined: Jul 2004
Posts: 210
Likes: 0
From: Lakewood CO
Originally Posted by RRT vette
I've used Bosch in the past with out problems, not to say they won't/shouldn't do it. Do you have an exhaust lean before the O2 sensor? Any extra O2 entering the exhaust stream will cause a lean condition.
I did have the code before I changed out the O2 sensor. From what I can tell from the smell, plugs and the gas mileage is that it is running rich. I figured the computer was trying to compensate for the lean code at the O2 sensor by using more fuel.
Bogus - Did you buy the Denso sensors at a local parts store? I couldn't find them at the places I called locally.
Thanks,
Dave
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Originally Posted by RRT vette
I've used Bosch in the past with out problems, not to say they won't/shouldn't do it. Do you have an exhaust lean before the O2 sensor? Any extra O2 entering the exhaust stream will cause a lean condition.
Originally Posted by L71Maynard
I did have the code before I changed out the O2 sensor. From what I can tell from the smell, plugs and the gas mileage is that it is running rich. I figured the computer was trying to compensate for the lean code at the O2 sensor by using more fuel.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by L71Maynard
I did have the code before I changed out the O2 sensor. From what I can tell from the smell, plugs and the gas mileage is that it is running rich. I figured the computer was trying to compensate for the lean code at the O2 sensor by using more fuel.
Bogus - Did you buy the Denso sensors at a local parts store? I couldn't find them at the places I called locally.
Thanks,
Dave
Bogus - Did you buy the Denso sensors at a local parts store? I couldn't find them at the places I called locally.
Thanks,
Dave
What I am saying is that the replacements just haven't impressed me with their durability.
You can get Denso at Autozone, about $25.00 each, may require ordering.
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