Computer,coil wires and plugs were replaced. The car runs great. But, the check engine light and ABS lights stay on. Could the programming be wrong? Can it be re-programmed?

SOURCE: 2001 B3000 Mazda truck vibrating when idling and

have you had the catalytic converter checked at the local exhaust shop? try that first. is the truck a 4wd? time to start checking the ujoints. do a compression check on all cylinders and see if there is a major drop in that hole that is misfiring. let me know what you come up with.

SOURCE: 1995 v6 mazda 626 abs computer/module

best i can tell you is under the left side of the instrument panel.. rather large connector for it as well.

SOURCE: I want to remove the catalytic converter. How do

You cannot bypass the catalytic converter and expect the car to run properly and the check engine light to remain off. When you go to replace the cat, DO NOT attempt to use an aftermarket brand. Even many of the "OEM" aftermarket converters do not have sufficient back pressure and within 2 months they are ruined. I know, I have replaced mine that was purchased at Advance Auto Parts three times in the last six months! Shell out the money for an original Mazda converter. List is about $736.50, but you can find a dealer in Virginia that discounts them 20% down to $589.08. Just remember, the car's computer is programmed to read the O2 sensors' data and adjust accoringly. A new Mazda cat will allow your car to run like it did when it came off the assembly line, everything else equal.

SOURCE: Check Engine light code 1506

this code indicates under-speed error has ocurred.
sets when PCM detects idle speed is 100 RPM lowerthan expected for 14 sec while break pedal depressedand steering wheel is straight ahead.

possible causes: IAC valve failure,intake leak,throttle body failure,opens or shorts in wiring between IAC and PCM.

SOURCE: I need to replace my mazda mpv catalytic

Ok the fastest way to solve weather it is the cats in the exhaust system is to take it too a exhaust specialist and ask them to do a exhaust pressure test. They should have all the pressure drop data there and can tell you if there is to much restriction in the exhaust, if there is to much chances are they will be the cats, usually the front one. Yep your dad is correct with his theory, but excessive overfuelling will also cause the cats to build up excess heat and start to melt, or fall apart. So get a good service when your able too, plugs/filters and oils. Yep your firing order is correct.

Testimonial: "Good detail, which specifically addressed each part of my question. Advice is directly on point and with layman's terminology. Extremely useful. "