whopper

Moved to the end of the previous 6 month old thread - for continuity's sake.

Oldblue

Replaced the throttle body, why, what was the reason for that decision.
Replaced the spark plugs, again why , what is your mileage, what plugs were used to replace the OEM plugs?
P0292, some sort of connection issue, that doesn’t make sense per
https://www.google.ca/search?q=C0292...&client=safari
P0300 a random misfire code.
P0303 misfire code for #3 cyclinder
P0573, code for brake lights per
https://www.obd-codes.com/p0573

Also why the fuel injectors cleaning, what triggered that decision.

I’m thinking loose wires, connections, grounds fuse box loose.

Jwparks34

Throttle body: my mechanic said that's why my car kept shutting down with the message engine power reduced.

Fuel injector cleaning: was told 6 months ago that would help. I did it and didn't have that problem for 6 months.

157,000 miles on car. A.c. Delco spark plugs.

Oldblue

So, he didn’t just clean the throttle body.
AC Delco 41-103 iridium plugs?
When was the last time the air filter was changed?
Has the battery been load tested?

donbrew

Why is he a "trusted" mechanic? He can't even read OBD2 titles much less what they mean.

You have a problem in your ABS system. The C0292 means that the EBCM is getting a bad signal from the yaw sensor.

The P0573 means your stop lamp switch is shorting to voltage. Maybe somebody installed LED bulbs?

And BTW the P0573 requires 11.5 volts to test, the c0292 requires 9.5 volts. A bad battery could do it.

Jwparks34

The battery is about 3 months old. Hopefully that isn't it. I'll check the stop lamp. I haven't installed any led bulbs. What is a yaw sensor?

Thanks for your help.

Jwparks34

No it has a brand new throttle body. Battery is 3 months old. Before that I had a serpentine belt go out on the alternator and had it replaced.

Air filter changed 6 months ago

Oldblue

Have the battery load tested, even brand new ones can fail, or not be fully charged when installed .
Have the ground wires checked, loose or corroded? That’ll mess up the computer

donbrew

I have absolutely no idea why the throttle body was ever a suspect, given the OBD2 codes.

Have the air bags ever deployed?

The yaw sensor is part of the stability system; it keeps track of lateral acceleration (sliding). There is also a roll over sensor.

C0292 will cause the engine power reduced. The remedy is to inspect the wires and most likely replace the sensor.

A better bet for the misfires is the fuel pressure.

To be fair; I recall a post from someone that claimed to be an expert saying that almost all misfires could be traced back to the throttle body. Maybe your guy listens to the same crap.

donbrew

The P0573 might mean that your brake lights are stuck on.