So, I started to notice mild pinging about 5K miles ago. Usually at mid and highway speeds when accelerating. I usually run Sunoco 89, but jumped up to 91 with hopes of shutting the pinging down. The cel came on about 800 miles ago. At that time, I was mired in 15 hour workdays, 7 days a week, so I just couldn't attend to the O2 sensors. Plus, it's been ****** freezing in NY up until now. I can't get the T into the garage with the high cap installed. In addition, I haven't had the chance to do much more than local driving, so the pinging wasn't obvious. The jobsite was less than 5 minutes from home! So, the other day, I got both O2 sensors (Denso) installed. I had to put some mileage on it before inspection that day so I took it for a nice ride. Whether local or on the highway, I couldn't make it ping if I tried!

If it's so that O2 sensors could have such an effect, even without a cel, is there a way to check them? Will a tired, yet not yet faulty O2 sensor somehow register on a scan?

On a side note: I bought a brand new '03 Tacoma X-tra cab TRD Offroad 3.4 V6. Silver. Beautiful truck. Loaded and expensive. At about 1.5K miles it started pinging. I only use quality gas. I tried changing brands, upping octane, nothing worked. It drove me nuts. Toyota was no help. I went to war with them. They tried to blame it on ticking injectors at first. When I finally got the regional tech in the truck, he had to agree with me, but would do nothing. Called it normal. Told me that I have a platinum warranty and don't worry about it. *****! It's one of the things that made me hate that truck and get rid of it. A bad memory that I don't even include in my sig line! Anyway, I suppose it's possible that I had a half ****** O2 sensor in that truck. Just maybe? Possibly?

Gone!

Rich