1) Because my problem is sensor 1 in bank 1, I should be purchasing an O2 sensor marked "before catalytic converter," correct? 2) O'Reilly's site, at least, notes "2 per vehicle" for all of the ...

We earn commissions from purchases you make using links in our articles. Learn more. If your car experiences poor fuel economy, lacks power, feels sluggish, idles rough, or has an illuminated check ...