Catalyst System Efficiency Below Threshold Errors
Thread Starter
Joined: Jan 2020
Posts: 11
It's baaaccckkkk... Now on 2/26 a few days ago, check engine light back on, now we're at 135,819, wasn't needing a fillup and in fact just recently got gas...... No symptoms of anything wrong driving-wise, so we added Marvel can to a 3/4 full tank of gas and about a day later the light went off.
It continues to be the P0430 Catalyst System Efficiency Below Threshold (Bank 2) - per my Bluetooth OBDII thing, and also the Vyncs real-time thing I had used earlier...
This time, once it cleared, I decided to use the Torque Pro app and my OBDII adapter to log a trip to the local hardware store a few miles away, and then also on the way back. I also read something to let it warm up first, so I did that - and it said to accelerate (and I did this while parked) and get the RPM's to just above 2000rpm's.. and I did that for a minute.. I had it logging all sorts of O2 and Fuel Trim stuff... the Excel file collected tons of stuff and some columns were blank, but I can see that there is clearly a Bank 1 and Bank 2 O2 sensor readings, voltages and what not.. however... I have no idea what to make of these readings, and if I have an actual useful log or not.
Anyone able to make sense of the attached excel data?
It continues to be the P0430 Catalyst System Efficiency Below Threshold (Bank 2) - per my Bluetooth OBDII thing, and also the Vyncs real-time thing I had used earlier...
This time, once it cleared, I decided to use the Torque Pro app and my OBDII adapter to log a trip to the local hardware store a few miles away, and then also on the way back. I also read something to let it warm up first, so I did that - and it said to accelerate (and I did this while parked) and get the RPM's to just above 2000rpm's.. and I did that for a minute.. I had it logging all sorts of O2 and Fuel Trim stuff... the Excel file collected tons of stuff and some columns were blank, but I can see that there is clearly a Bank 1 and Bank 2 O2 sensor readings, voltages and what not.. however... I have no idea what to make of these readings, and if I have an actual useful log or not.
Anyone able to make sense of the attached excel data?
Thread Starter
Joined: Jan 2020
Posts: 11
The PO420 and PO430 error codes continue to occassionally pop up. Since I've let this go on for so long. A pattern has occurred.
Basically after a month or so of driving, but not at every fill up, but quite consistently after a full tank fill up - this car will shortly thereafter (like that same day or the next) will throw a PO420 or PO430 and just recently it threw both at the same time which is the current state it is in.
I have captured Torque Pro faults and it clearly shows that when it is the PO420
MID: $21 TID:$a1
Catalyst Monitor Bank 1
Min: 0V Max: 3V
Current: 3.246V
I have captured Torque Pro faults and it clearly shows that when it is the PO430
MID: $22 TID:$a1
Catalyst Monitor Bank 2
Min: 0V Max: 3V
Current: 3.233V
This is what is causing the Check Engine Light to come on. We have determined over time that if you don't even add Seafoam or Marvel or whatever, the Check Engine Light at times has certainly turned off on its own.
We have no rough idling or acceleration sluggishness - car seems perfectly fine.
The Honda Dealer is like just keep feeding it Seafoam periodically, they have checked it out and didn't seem to think the Oxygen sensors were a problem or any other pressure related things. Have suggested that they can replace the catalytic converter for like 1800 to 2000 bucks but were not really advising that since no car symptoms and you can buy a lot of Seafoam for 1800 bucks...haha..
Isn't the fact that it occurs consistently after a tank fill up any sort of indicator of 'something' to any body? and isn't the Current Voltage reading being higher than the Max of 3V occurring on Bank 1 and Bank 2 an indicator of anything?
Should I just get the O2 Sensors and wiring replaced, or is that foolish - since not having any actual car symptoms aside from the Check Engine Light coming on?
Basically after a month or so of driving, but not at every fill up, but quite consistently after a full tank fill up - this car will shortly thereafter (like that same day or the next) will throw a PO420 or PO430 and just recently it threw both at the same time which is the current state it is in.
I have captured Torque Pro faults and it clearly shows that when it is the PO420
MID: $21 TID:$a1
Catalyst Monitor Bank 1
Min: 0V Max: 3V
Current: 3.246V
I have captured Torque Pro faults and it clearly shows that when it is the PO430
MID: $22 TID:$a1
Catalyst Monitor Bank 2
Min: 0V Max: 3V
Current: 3.233V
This is what is causing the Check Engine Light to come on. We have determined over time that if you don't even add Seafoam or Marvel or whatever, the Check Engine Light at times has certainly turned off on its own.
We have no rough idling or acceleration sluggishness - car seems perfectly fine.
The Honda Dealer is like just keep feeding it Seafoam periodically, they have checked it out and didn't seem to think the Oxygen sensors were a problem or any other pressure related things. Have suggested that they can replace the catalytic converter for like 1800 to 2000 bucks but were not really advising that since no car symptoms and you can buy a lot of Seafoam for 1800 bucks...haha..
Isn't the fact that it occurs consistently after a tank fill up any sort of indicator of 'something' to any body? and isn't the Current Voltage reading being higher than the Max of 3V occurring on Bank 1 and Bank 2 an indicator of anything?
Should I just get the O2 Sensors and wiring replaced, or is that foolish - since not having any actual car symptoms aside from the Check Engine Light coming on?
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