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In that case, is fuel pressure (either pump problem or clogging) more likely or dirty injectors not producing good mist? I don't know to diagnose...
I cleaned the MAF sensor thinking it might solve the issue but no deal. The LTFT is usually in the high teens but can range from 10% to 30%. MPG...
UPDATE: I checked the back pressure in the first O2 sensor port and it was only 1PSI at 2500 rpm so I'm assuming there's no cat clogging but after...
I also now have an occasional P0171 code. Can the lean fuel condition be caused by a faulty O2 sensor? I've not yet checked for intake leaks or...
I'm guessing you know this already but the EGR cooler (dirty/restricted) is a likely root cause which will eventually destroy the Cat or do even...
I've read some cases where the pour in stuff worked but I'm guessing this would be VERY EARLY in the process. If there is continued contamination,...
The SeaFoam can is normally recommended for spraying directly into the intake airstream with motor running. When can is empty, the motor is...
Cataclean was tried with no noticeable benefit. I think this cat has been pushed way past that point, but maybe 30K or so miles ago would have worked.
Cat removal and soak would be the next logical step but it has no detectable exhaust flow restriction at this point. I did order an O2 spacer so...
It's a 2013 Prius which I should have clarified. I also have a 2007 but not sure where the 2004 came from. It's a 2013 although I also have a...
On my scanner, it says p0420 1/1 Permanent but the yellow light is on indicating Pending. After some driving (maybe one drive cycle) the scanner...
Code P0420 is causing check engine light. After clearing the code, it is immediately pending again and will return to permanent within 20 or 30...
OK, what would you see as an indication that the upstream rather than downstream sensor should be replaced? Is that a completely missing reading?
I can't recall seeing a separate temperature probe anywhere, including parts diagrams. Therefore, you and Chapman would be correct that these...
Did you pull the rear Cat pipe loose for drainage? I'd be worried about possible fire inside there. Could blow some compressed air into there as...
Then, maybe the P0420 code is related to an O2 sensor? I think those should be replaced as this car probably has the original ones after 185K miles.
I'm certainly not an expert on Cats or scanners but the Innova scanner manual has the following on these data. It seems to indicate the data are...
I'm thinking the Gen 3 with 185K on it has never had the O2 sensors or Cat have ever been replaced. I'm planning to do the sensors in any case. At...
Test Drive Update: The Gen 3 really sounds good and runs well. I used the CRC Intake Valve and Turbo Cleaner via the throttle body to attempt to...
