P0420

ferds · Postby **ferds** » Thu Oct 28, 2010 3:38 pm

Hi all!

So I get a P0420 Catalyst Efficiency Below Threshold (bank 1) on my 2005 Pathy. Is bank 1 the passenger side?

Tech · Postby **Tech** » Thu Oct 28, 2010 9:30 pm

ferds · Postby **ferds** » Fri Oct 29, 2010 10:35 am

thanks tech

driftedoffroad · Postby **driftedoffroad** » Mon Nov 01, 2010 12:17 pm

any updates with a fix? I had this code once but it has not come back. my rear o2 on that side reads lean, already replaced it and no change. I think I may have a small leak at the flange before the rear O2. Let me know what you end up coming up with. Thanks!

Tech · Postby **Tech** » Mon Nov 01, 2010 5:01 pm

If by lean, you mean steady below 450mV......thats normal and wont give you a cat code. Actually indicates good cat operation. Cycling to close to the threshold compared to the front will cause the code.

ferds · Postby **ferds** » Mon Nov 01, 2010 7:09 pm

dropped off the pathy at the dealer tonight. service advisor will let me know what the fix will be. however, he did tell me that bank 1 is the driver side. that cat was replaced a month and half back. maybe the o2 sensor is bad?

driftedoffroad · Postby **driftedoffroad** » Tue Nov 02, 2010 7:46 am

Tech wrote:If by lean, you mean steady below 450mV......thats normal and wont give you a cat code.

I never said what it was reading....I said it was reading lean.
It reads .29v always with minimal to no fluctuation regardless of creating a lean or rich condition to check if the reading changes.
The other side reads normal and will fluctate accordingly.

Good luck and let us know Ferds!

ferds · Postby **ferds** » Tue Nov 02, 2010 4:37 pm

got the pathy back from the dealership this afternoon. they replaced the cat converter. it was still under 8/80000 so it was replaced no charge to me. now i have two new cats on the pathy. would have cost me a little over $2000 (both cats) if i was over the warranty.

so to sum up all the repairs/replacements from the beginning of summer this year:

IPDM
Fuel Sending Unit
Cat Converters
Oil Pressure Sensor
Tranny bypass

P0420

P0420

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