2004 Toyota Land Cruiser — catalyst efficiency code but car drives normally

I wouldn't throw parts yet. Move a coil or plug on the 2004 Toyota Land Cruiser if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. I'd want a dollar figure or a measured spec, not 'should be fine.' I refuse to clear codes until someone else sees them.

It did catalyst efficiency code but car drives normally twice this week, both times after sitting. No change in mileage feel. I'd rather pay for diagnosis than a second guess-repair.

This is usually cheaper to test than to guess. Move a coil or plug on the 2004 Toyota Land Cruiser if it's cylinder-specific and see whether the code follows. Don't erase codes until someone who can help has seen them. This is from a 2004 Toyota Land Cruiser in California. Stop there until you know. A day of patience here is cheaper than a wrong part. I'd rather pay for diagnosis than a second guess-repair.

Log the conditions before you spend. Two 2004 Toyota Land Cruisers can feel identical and have different causes, so measure before you copy someone else's repair. That's the branch I'd chase this week. On “catalyst efficiency code but car drives normally,” that was the fork that mattered for me. Was this after sitting overnight? I already checked the easy fluid levels.

Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 2004 Toyota Land Cruiser and see if the fault moves. That's the branch I'd chase this week. This is from a 2004 Toyota Land Cruiser in California. A shop burned me once by skipping that step. I'm keeping receipts and dates in one folder.

If it were in my driveway, loaded-suspension checks on the 2004 Toyota Land Cruiser catch play that a wheels-hanging inspection misses. Save the big job until that test fails. That's the whole play. Not trying to scare you — just skip the expensive first guess. I'd rather pay for diagnosis than a second guess-repair.

Ask what changed right before it started. Two 2004 Toyota Land Cruisers can feel identical and have different causes, so measure before you copy someone else's repair. Don't erase codes until someone who can help has seen them. This is from a 2004 Toyota Land Cruiser in California. That's the whole play. I'd rather look cautious in this thread than stuck later.