Alright,
To sum up my vehicle’s history:
2005 Toyota Tacoma V6 (SR5 Crew Cab with 4x4) with 240,000kms
I bought it in February 2022, put on about 2500kms and then the CEL came on.
The codes were P0430 and P0420.
Seeing as the truck seemed due for O2 sensors, I replaced all four sensors with OEM sensors myself. The truck seemed to run better and my mpg jumped from 14.5 to 18.9 when I next checked my trip odometer.
However, back came the CEL and the two same codes.
My question then is, which parts do I replace to fix this? There seem to be 4 cats, but which do I need to replace? I get my parts from rock auto, so if someone knows and could link them that would be awesome.
If more info is needed, please let me know. I’ll check back daily and try to keep things updated.
Do I get front, or rear?
If the problem is bad catalytic converters (quite possible on a 17-year-old vehicle), it would be those that are monitored by the O2 sensors generating the codes. Before condemning the converters you should troubleshoot the items listed in the "possible causes" section in the autocodes.com link provided by @doc. Firing up the parts cannon rarely brings a satisfactory result, proper diagnosis is required. You could also attempt cleaning the converters if all else appears to be OK.
I appreciate your comments. I’ll probably end up taking it to a muffler shop for them to give me a quote of the work they’d do.
If it seems to be doable with parts from rock auto then I’ll crawl under the truck and get r done.
If their rates aren’t too high then I’ll just have them do it and save myself the headache.
Alright, we’ll yes, those are helpful links, but I don’t know which item to purchase for replacement. There seems to be an indication of both left and right(I assume I need one for each side if I’m getting both codes) but also for front and rear.
Do I get front, or rear?
Please see the FAQ
I read the whole thing, doesn’t help me much at this point. I just need to know which part to replace based on what’s available on rock auto.
did you watch the videos about how to diagnose your catalytic converter?
You will need to troubleshoot to find the cause of your problem. Throwing parts at it is a fools errand.
Yeah, diagnosing the specific offender seems to be the hard part and why it might be the time to take it in to a shop.
I know what the parts go for, so bargaining for a decent rate might be in my realm of possibility.