I've been struggling with various CEL codes since I bought my 2004 Xterra 3.3l. Lately they have been converter/O2 codes.
I replaced the passenger side (bank 1) sensors up and downstream. I bought the cheap Kwiksen ones off of Amazon. The upstream sensor seemed to still have problems so I replaced it with a Bosch sensor. That seemed to help. And after that I also found a vacuum hose that was disconnected and since the the car has run much better.
However today I got a P0037 code (bank 1, downstream...Kwiksen sensor) and while waiting in line at the car wash I noticed that my temp was at 219 degrees! I'm not sure if the two could be related or not. I replaced the thermostat, water pump, hoses and coolant just a few months ago. And the fan seems to be working. I'm not sure what that was about.
Attached is a snapshot of the 02 sensor voltage. What does this say? To me it looks like the Kwiksen sensor (bank 1 sensor 2) is bad. But bank 2 doesn't look right either. Bank 2 almost looks like a bad converter.
I dont think the OP is worried about it being fast, just wants his truck to operate as intended. Cutting off the cats isn't the solution, that's a band-aid. For the record, I'm not hung up on EPA standards - as far as I'm concerned that alphabet agency needs to be dissolved like years ago. Nor am I espousing returning to the dealer or against the removal of catalytic convertors altogether. Your downstream O2 shouldn't really be reporting anything substantial, at the very worst case scenario I'd say get some MIL sensors shunts and just keep it simple if you're gonna hack at it.. The upstream ones should be the only ones reporting to the ECU but If it were me I'd start taking on the issues of either a vacuum leak or a faulty injector on that side of the engine, perhaps a poorly performing EGR or TAB and/or TAD type solenoid(s). FPR would be a long shot as an issue. But what I would look for is things related to Air/fuel management.Unless bound by inspection, 110000 miles I would cut the cats. True headers or like I used the Pacesetter hybrid manifolds. My truck had a hundred and sixty thousand on what I believe to be the original cats. There's a world of difference now! Idler 2 into 1 2 & a half inch exhaust using a baby turbo muffler. It has a real nice low Rumble now and definitely more low-end torque. These motors are like a Harley, they're never going to be fast!
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If you cut off the cats, and remove sensors, you will undoubtedly still have the problem, it will at sometimes more or less hinder the performance and MPG of the vehicle and get no real remedy or resolve, just lost $1300 in Catalytic convertors and still have a problem. All you'll be doing is removing the tell-tale system designed to let you know hey, there is a problem here.
Also, I'm not a Harley guy whatsoever.. I prefer my fav Yami R6 or my Kawi 600 all day long..I prefer the quicker corners than straight out lines and all out speed (I've got kids to see grow up and if that speedo said 220mph on it, i'd likely be dumb enough to try it twice a day going to and from work). To use an analogy as you did is completely parroted from another source that clearly not of your own and doesn't research much. case in point: to say Harley's arent or cant be fast is a false statement.
That's just embarrassing for a 1L owner..
If you ride at all(?), Harley riders is more of a lifestyle and generally lesser aggressive [unless a biker fight breaks out] form of riding its not about the testicular moments of speed as it is about the open air freedom. However as you seen in the 25 yr old self made home garage chopper attitudes can institute dramatic changes in driving habits as further seen by this man.
To argue there arent riders or bikes setup to make even these guys look bad would be absurd. To state whether what bike or style of bike is better based upon swooping body lines and tank laying positions vs excessive chrome and obnoxious exhaust tones while laying backwards on a sissy bar is, well.. again poorly executed based upon the lack of FACTS presented or research done. We see this day after day, by the hour even in everything from 2A arguments to well, pretty much everything.
Now as far as researching and having a couple decades experience. I can say that unless you own a 72-79 VW bug or 68-79 VW Bus.., Pacesetter is doing nothing to make any real HP if not cost you some. Not even any that the ass-dyno would reveal if it was fantasizing about HP. Working in an environment as a import parts counter guy unless an exhaust component was no longer available and the customer wasnt willing to pony up for anything outside of Stock or real performance upgrades for whatever reason. Pacesetter and Bosal were the next two choices as they tend to buy out old parts patents from the manufactures. Much like ITM does with Honda engine parts. Their general replacement stuff is still or used to be crimp-bent tubing. Outside of their Monza line. I mean if you're looking for performance, crimping exhaust flow is staggeringly horrible for exhaust scavenging needs for power production. That's not uncorking the exhaust.., its a sick form of automotive erotic asphyxiation IMO, and you paid for it. Even the sound is tinny and whiny like on the full exhaust setups.
Look on there 1998 styled website, they even clearly tell you that their exhaust is T304 Stainless Steel. Well that's great, its the same quality of steel nearly every auto manufacture offers on any car under $60k so it'll last about the same, maybe less due to the even thinner wall construction. Keep an eye on your welds on your Pacesetter Hybrid Mani's there. Their product sells because of its LONG time name on older cars that still get pushed forward with time since 1972'ish, they make it cheap and the margins are good for those that sell it.
Look who sells it? Jegs, Carid, Amazon (but they whore everyone's products), Summit, EBAY, and any other made up auto company that has no real inventory or warehousing and plays middleman. Yea they're all big companies but I think for many you' really dont understand all that entails in how or why that is and how it works for Pacesetter to drop ship for them. Marketing and long term business identification go along way I guess.
But dont let my opinions snub things. Go to their website. States copyrighted from 1972-2018. You think in 46 years someone in that company would have done way back when, an about us page? https://pacesetterexhaust.com/pages/about-us or at least had the common sense to remove the Shopify/Wix website creator content from it and the link to not bring attention to how hokey (or cheap) to put good content in its place? You can see how desperate they are to cling to a name by seeing they still boast about Vanna White being the spokes person for Pacesetter before finding fame on television. Hell i bet you 60% of the young men on this site don't even know who she is let alone care. 600 products that fit 25,000 vehicles they say. How many people do you see rocking their stickers on the street or at the track? (Aforementioned VW examples DONT count) lol
Sorry for the /rant I'm really not trying to bag on you, as much as I am trying to make a point, as to what we say or give as advice, especially if you can poke as many holes through it as a fishing net for common sense or solid foundations of advice. This is why when people post an issue one of two things happen. Either you get 92+ views and no comments or offerings of help in 2 days or you have a host of people suggesting everything to just throw parts at a problem until it fixes itself.. Maybe I'm being a bit of a jerk, maybe I was just inspired to roast the company for what it is, I'm just calling it like I see it.