should I replace my ELD before the 2 O2 sensors those 3 and my speedometer come up as faulty I know I can do the ELD myself O2 sensors not really 98 civic ex 177,000 also awful sound only when in reverse and always have to press shift lock thing to get out of park Is it worth time energy money have had a few years love the car have spent quite a few $$$ and need to renew reg next month thanks for any thoughts