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hey guys just wondering if anyone knows why header cars blow through upstream o2 sensors? Iv had catless long tubes since last May. Had the right side primary o2 sensor replaced in September due to multiple misfires and throwing an o2 sensor code for that side. Car has ran great for 7 months. Yesterday same symptoms very rough idle stumbling hardly drivable blinking cel. Same thing as before. Made it to gas station across the street shut it off, filled with gas, started and car runs perfect no light. Scanned it when back home p2414 bank 1 sensor 1 is the only pending code. The exact same o2 sensor replaced only 3k miles ago. What’s the deal? Is there something else going on, or is it just something I should have on hand at all times for constant replacement. Getting it replaced today but just wondering if others have the same issue of constant o2 replacements?
hey guys just wondering if anyone knows why header cars blow through upstream o2 sensors? Iv had catless long tubes since last May. Had the right side primary o2 sensor replaced in September due to multiple misfires and throwing an o2 sensor code for that side. Car has ran great for 7 months. Yesterday same symptoms very rough idle stumbling hardly drivable blinking cel. Same thing as before. Made it to gas station across the street shut it off, filled with gas, started and car runs perfect no light. Scanned it when back home p2414 bank 1 sensor 1 is the only pending code. The exact same o2 sensor replaced only 3k miles ago. What’s the deal? Is there something else going on, or is it just something I should have on hand at all times for constant replacement. Getting it replaced today but just wondering if others have the same issue of constant o2 replacements?
I'm in the same boat. At this point i'd like to try the ntk's.
I had replaced them in october of 2015. Drove with them for maybe 10k. I had to replace one again in summer 2016. The car was stored in the winter. I drove summer of 2017 a total of 1000km give or take. Just pulled the car out, and I'm getting the same codes.
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
I immediately blew out my OE sensors after putting on headers (MBH). They've been fine since (3yrs) and I'm just now replacing them. Doesn't appear to be any consistent reason as far as I can tell but the first place I'd look is at how the different manufacturers position that upstream O2. It could be that the positioning is too far off from OEM spec (i.e. bad angle, not far enough back in the merge, too close to a particular chamber) or bad gas or messed up fuel mix in the tune (i.e. too rich). A lot of other makes have this problem too with headers, and O2's are particularly sensitive to moisture. If the O2's are not on the top side of the pipe and angled down, any moisture that gets on that ceramic heating element before the exhaust is up to temp will crack it. I'd look at that first.
I immediately blew out my OE sensors after putting on headers (MBH). They've been fine since (3yrs) and I'm just now replacing them. Doesn't appear to be any consistent reason as far as I can tell but the first place I'd look is at how the different manufacturers position that upstream O2. It could be that the positioning is too far off from OEM spec (i.e. bad angle, not far enough back in the merge, too close to a particular chamber) or bad gas or messed up fuel mix in the tune (i.e. too rich). A lot of other makes have this problem too with headers, and O2's are particularly sensitive to moisture. If the O2's are not on the top side of the pipe and angled down, any moisture that gets on that ceramic heating element before the exhaust is up to temp will crack it. I'd look at that first.
MBH headers from day one. Maybe it's the short run cycle's.
I have gone through 3 brands and found ones that worked the longest so far.i think I have ngks in there now.
its moisture from the position the o2s are at.they are way further back from the oe spot.it took me so much trial and error to see it but from putting my car on jack stands 50 times I took the sensors out before starting and noticed they have dripping condensation on them.
I have gone through 3 brands and found ones that worked the longest so far.i think I have ngks in there now.
its moisture from the position the o2s are at.they are way further back from the oe spot.it took me so much trial and error to see it but from putting my car on jack stands 50 times I took the sensors out before starting and noticed they have dripping condensation on them.
Where did you get your ngk o2 sensors from. I think I’m going to buy some to have on hand. Are they direct replacement no modification. I ask because I saw some didn’t have the connector attached and were more universal style.
Where did you get your ngk o2 sensors from. I think I’m going to buy some to have on hand. Are they direct replacement no modification. I ask because I saw some didn’t have the connector attached and were more universal style.
sorry I had to look it up( bought so many) Im running denso sensors right now and got them on amazon.
Last edited by skratch77; Apr 5, 2018 at 04:18 PM.
I've been having the same issue with my LTH...it seems the first couple years I had no issue, then after that boom I get about a year out of the car before one side or the other goes bad. I'm putting on around 5k-6k miles per year, and usually 5 mile commutes. I read it was possibly from being placed too far back so they don't get heated up enough, causing the internal heaters to overwork and fail...but it sounds like maybe it is condensation? Either way it's annoying...probably go back to stock though since I'm thinking about trading it in in the near future.
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