Secondary o2 sensor cel after exhaust install?

I just put a cat back on my 99 Honda accord with the f23a1 and it set off my cel immediately. I unplugged the battery and it fixed it for a few hundred miles and now it's back on. The first time it was running rich, I'm not sure how the air/fuel ratio is now. Do I need to upgrade my o2 sensor? I could replace it with an oem denso o2 sensor or something better like an NGK.

Who knows about inverters?

Hi, I want to purchase an inverter for my parents car, a 1999 Honda Accord, but I don't the right one. It's to power phones, laptops, and a printer, and even for the unexpected emergencies. Any experts on this topic?

Should I buy a new, CPO, or used Honda Accord for commuting?

I just got a new job out of town and my commute will average 25,000-30,000 miles per year. Since I will be adding so many miles to the car every year, does it make more sense to buy a new car because of the warranty and slightly better gas mileage, a CPO because of slightly cheaper upfront cost, or a used car with 40,000-60,000 miles already on it but for $16,000 (instead of $20,000 for CPO or $25,000 new)?

Honda Accord transmission is shifting funny?

So here's the deal: Car is a 2000 Honda Accord 4 cyl, 4 speed auto with 165K miles. When I'm first driving the car in the morning, the car hangs in first gear a little bit longer than it should. Usually it comes out of first gear around 2500-2800 rpm, but lately it revs up to over 3000 rpm for no apparent reason before shifting. When I start the car up in the afternoon after work, it doesn't seem to have that problem. I only notice it in the mornings. The trans fluid is fine, it only has about 10K on it. Does anyone have an idea of what the problem might be?

95 honda accord EX. Everything is original under the hood. What to do?

I had a mechanic act rather surprised that virtually every major component *under the hood* of my 95 accord sedan EX automatic is factory original. This includes the timing belt, alternator, and virtually everything else. It has 190,000 miles on it.

The only complaint I have about my car is that it feels like I have to press too hard on the brake at slow speeds, and the steering feels a bit "goosey" or "loose" at highway speeds. Although, neither of these problems are severe, maybe I'm noticing things too much since I'm used to driving a new Camry?

I would like to be able to drive my car another 100k miles if possible. What is a list of everything that should be replaced and done to my car?

Added (1). I'd also like to be able to take this car on some long road trips without worrying about it breaking down. What all should be replaced or updated?

Why won't my turn signals work?

I have a 1988 honda accord, and I went to get it inspected yesterday, and ever since then the turn signals won't work… But they worked just fine at the inspection until I turned the car back on. Does anyone know what could be happening?

Changing fuel filter 1996 honda accord v6?

I have a 1996 Honda Accord v6… My gas mileage has progressively been getting worse over the past month or but I have had my O2 sensors replaced, my air filter is clean, I have changed my oil filter & got oil change and I have replaced the spark plugs but this was all about 3 months ago… But I have never got my fuel filter replaced and the person I have bought the car from said he never replaced the fuel filter before either