this post was submitted on 18 Apr 2025
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Mechanic Advice

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'99 Corolla engine code P0125 (midwest.social)
submitted 1 week ago by [email protected] to c/[email protected]
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I'm trying to diagnose a p0125 code on my 99 corolla. Toyota forums seem to say Toyota didn't follow standards on this code and it is likely also the O2 sensor, can anyone confirm if this is the case?

I'm getting no other codes, and it will run for about 30 minutes before triggering again. Last time it triggered I saw exhaust smoke on the way home, which went away as soon as I reset the code. after clearing the code the exhaust while clear does seem to be rich smelling. Engine seems to run fine, I'm not noticing any performance issues, not signs of dipping oil/coolant amounts. coolant gauge is operating and hitting the halfway point normally.

I can't think of anything else but the O2 sensor but I expected rougher performance and don't really want to spend $125 on a part if I don't have to.

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[–] [email protected] 1 points 1 week ago (1 children)

They do, though admittedly I’d steer anyone towards Honda over anyone else for price and longevity. We have a 1978 Honda in the garage that runs almost like new still!

Now I won’t say motorcycles are as safe as cars (statistically they’re not), but I will say it is less risky than many people think. The majority of fatal crashes involve no helmet and a very large portion involve alcohol unfortunately. The average commuter who gear up is fairly safe if they’re conscious of the weather and road. Plus they make vest worn airbags now that are showing incredibly promising things if you do know someone who rides. Something like a 89% reduction in spinal injuries. (YouTube link)

[–] [email protected] 2 points 1 week ago

Yeah Honda’s are nice. It just sucks cuz even if you don’t get into a major accident, a small hit could fuck up your day vs a car you just carry on.