2006 Mazda RX-8 — battery dies after the car sits for a weekend

Intermittent stuff lies if you only catch it once. Two 2006 Mazda RX-8s can feel identical and have different causes, so measure before you copy someone else's repair. Save the big job until that test fails. On “8 — battery dies after the car,” that was the fork that mattered for me. This is from a 2006 Mazda RX-8 in Orlando. That's the whole play. This is the filter I use when the thread starts repeating itself. This is the version I'd tell a friend.

This is usually cheaper to test than to guess. Capture voltage while the 2006 Mazda RX-8 is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. Had a similar mess a couple years ago and that's what finally sorted it. I'll update if anything new shows up.

Tried a second charger / second scan and the story on the 2006 Mazda RX-8 didn't change. This is the version I'd tell a friend.

Log the conditions before you spend. Swap the cheap/easy piece first on the 2006 Mazda RX-8 and see if the fault moves. Don't erase codes until someone who can help has seen them. On “8 — battery dies after the car,” that was the fork that mattered for me. I'd want that in writing, not as a promise. Wrote this up on my lunch break.

I'd want a measurement, not a hunch. A pressure test beats staring at a dry driveway if the 2006 Mazda RX-8 is losing coolant with no puddle. Save the big job until that test fails. Stop there until you know. Not trying to scare you — just skip the expensive first guess. Cold start is when I can actually reproduce it.

Start with the test that can prove you wrong. Get a real battery/charging test on the 2006 Mazda RX-8, not just resting voltage, before blaming a module. Don't erase codes until someone who can help has seen them. Take it or leave it — that's what I'd do. Wrote this up on my lunch break.

Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2006 Mazda RX-8 is losing coolant with no puddle. Don't erase codes until someone who can help has seen them. On “8 — battery dies after the car,” that was the fork that mattered for me. If it doesn't change the out-the-door or the repair estimate, it's noise. This is the filter I use when the thread starts repeating itself. This is the version I'd tell a friend.

Start with the test that can prove you wrong. Capture voltage while the 2006 Mazda RX-8 is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. Was this after sitting overnight? I refuse to clear codes until someone else sees them.

If it were in my driveway, loaded-suspension checks on the 2006 Mazda RX-8 catch play that a wheels-hanging inspection misses. Don't erase codes until someone who can help has seen them. Do that first. I keep a notes app thread for this now.