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11-18-2015, 06:46 PM | #1 |
Drives: 2007 Toyota Yaris Join Date: Nov 2015
Location: Winnipeg,Manitoba, Canada
Posts: 8
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P0420 code
When you get code P0420 catalyst system efficiency below threshold bank1. How to find this problem? Need help pls.
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11-18-2015, 07:30 PM | #2 |
Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
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How many km's on the car? Need a bit more info. Burning any oil between oil changes?
This means that the cat is either very dirty, semi plugged or insides are broken to where it is working less than 95% efficiency (that triggers the CEL). Burning excess oil can foul the cat causing this. Generally only solution is replacing the cat, but you need to fix the issue of why this happened first so it doesn't happen again. My '02 Echo has this code. I was able to still get it past emissions using my ultragauge, seafoam and understanding that one system check can still be not ready and it can still pass
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11-18-2015, 07:45 PM | #3 |
Drives: 2007 Toyota Yaris Join Date: Nov 2015
Location: Winnipeg,Manitoba, Canada
Posts: 8
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It's a 173,a bit km no burning oil running still good
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12-11-2015, 08:42 PM | #4 |
Drives: 2007 Toyota Yaris Join Date: Nov 2015
Location: Winnipeg,Manitoba, Canada
Posts: 8
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Actually I found 2 more code clear all the code but come back after 4 days. It's always come together 3 code P0420,P0441and P0455. Change fuel cap and also I check purge valve solinoid working the way it should. Car run fine. Why 3 code always coming together? Any one encounter this before? Pls. Need help
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12-11-2015, 08:47 PM | #5 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
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0420: Catalyst System Efficiency Below Threshold (Bank 1)
Causes: - Front exhaust pipe (with Three-Way Catalytic Converter) - Gas leakage from exhaust system - A/F sensor (sensor 1) - HO2 sensor (sensor 2) 0441: Evaporative Emission Control System Incorrect Purge Flow Causes: - Purge VSV - Connector/wire harness (Purge VSV - ECM) - Canister pump module - Leakage from EVAP system - Leakage from EVAP line (Purge VSV - Intake manifold) - ECM 0455:Evaporative Emission Control System Leak Detected (Gross Leak) Causes: - Fuel cap (loose) - Leakage from EVAP line (Canister - Fuel tank) - Leakage from EVAP line (Purge VSV - Canister) - Canister pump module - Leakage from fuel tank - Leakage from canister
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12-15-2015, 07:18 PM | #6 |
Drives: 2007 Toyota Yaris Join Date: Nov 2015
Location: Winnipeg,Manitoba, Canada
Posts: 8
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Thanks for all info. Start checking for the possible problem. One more thing come out air bag on. I read the procedure to check for air code for 06' yaris. It is the same for 07' jumper tc + cg to get code for air bag
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12-15-2015, 08:07 PM | #7 |
Drives: 2007 Toyota Yaris Join Date: Nov 2015
Location: Winnipeg,Manitoba, Canada
Posts: 8
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Is this 3 code I'm getting is all related cuz is always coming together
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01-01-2016, 06:04 PM | #8 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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I have the P0420 code now after turbocharging my car. I built a new full 2" exhaust using the stock Cat. I never got this code before on my old engine. Is it possible the Cat simply isn't getting as hot now? Because the entire turbo system is built from very heavy schedule 40 weld together piping. I haven't wrapped it yet but will be doing that soon at my next oil change.
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01-01-2016, 07:22 PM | #9 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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Quote:
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01-01-2016, 07:24 PM | #10 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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It's running on stock numbers out of boost 95% of the time. Only past 1psi that there any mods to fuel and timing. So it runs 14.7afr out of boost.
I've got new plugs to go in too when I change the oil and wrap the pipes. Only reason I'm thinking it's not hot enough to is that the stock exhaust before the Cat was a double wall pipe and that would definitely keep the heat in. |
01-01-2016, 07:39 PM | #11 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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Quote:
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01-01-2016, 07:53 PM | #12 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Yeah got a nice one for Xmas.
The front O2 sensor is fairly new but the secondary is still original. Unfortunately my AEM AFR sensor failed in under 3000km and they wouldn't replace it so I've been unable to monitor the AFR for a few months. |
01-02-2016, 11:25 PM | #13 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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P0420 code
Monitored the Sub O2 in the driveway today after a short drive to heat everything up. Holding at 2000 rpm the reading was pretty steady at .780-.820V. With the occasional dip and then back up. At idle it bounces back and forth almost the same as the primary but a bit slower.
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01-03-2016, 01:55 AM | #14 |
Drives: 2009 5-door, 5-speed Join Date: Sep 2011
Location: White Rock BC
Posts: 687
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Thats the results of a "good" cat. It's possible that your cat is border-line and only fails occasionally. It's also possible that your exhaust has an air leak sometimes, or that the turbo is running too much exhaust for the OE cat to handle.
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01-03-2016, 08:35 AM | #15 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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I had JUST added heat wrap to the downpipe and just in front of the Cat too so time will tell I suppose. The freeze frame data showed the last time it set a code I was cruising at 2200 rpm at 65km/h and light load. But that was with old plugs and no heat wrap.
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01-04-2016, 03:56 PM | #16 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Well, two trips and no pending code and the readiness test on my scan tool show the cat as ready, so I'm a happy camper.
I'm thinking it was my plugs being slightly damaged from running lean in boost when I first built my turbo system. I reused my old plugs from the old engine. I replaced them with one step cooler plug this go around and left the gap they came with at .038" |
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