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Topic
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00 4cyl Camry, 195k miles Cali emissions
A few months and almost 2000 miles ago had P0420. Replaced cats with Cali approved Bosal, and also replaced both sensors with Denso.
Cleared codes, set readiness, has been fine until last night. P0420 returned! My NY inspection is due so I need to get this repaired.
I’ve read that intake leak and injectors can also cause this. I smoked it and found this crack. Would this cause P0420? No other codes current or pending. I have ordered this tube, but won’t be here until tomorrow. I’d like to check other items while waiting, if possible.
How can I check if an injector is leaking?
What else can I check for causing this code?
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I’ll put the end at the beginning. I passed inspection, but would rather not say how. You can probably guess.
Took it to a dealer, but they said it had the most current software.
In an effort to chase the fuel trims, checked with a known good MAP, same readings. Took apart the intake and all vacuum lines and smoked individually, which means I plugged one end while smoking it at low pressure. During this I found a lot of “maybes”. Cracked ends of lines, loose older lines. I replaced as I found them and began to wonder if the combined tiny leaks were causing one big one. Replaced gaskets (intake, throttle body, valve cover).
Swapped my fuel rail and regulator with a known good one, same readings.
Removed both cats and both rear exhaust pieces and smoked individually. I got SO excited finding a pinhole leak at the rear sensor, but it was repaired and as you can guess, it didn’t help.
I just want to thank you guys for hanging in there and helping me brainstorm this. I learned a lot and some of you really know your stuff. In 18 months I may have this car again in my life (it belongs to a family member) to try to finally find the cause of the fuel trim issue. But I can’t keep their car forever, and they only wanted a sticker.
I was hoping to find the cause to help someone else “suffering” as I have, and I am sorry I don’t have better news.
Thanks again to all those who tried and tried and tried with me!
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