2012 Honda Odyssey EX-L. 108,270 Miles. Houston, TX. (but the majority of miles were in Southern CA and MA)
I had a CEL, using my BlueDriver Bluetooth OBDII Scanner, I pulled Code P0420 - "Catalyst System Efficiency Below Threshold Bank 1"
After reading a bunch of posts on this forum, the first suggestion seems to be to replace all 4 oxygen sensors even though the problem is likely the Catalytic Converter. My questions are below:
1. Can someone confirm that the 4 oxygen sensors I should buy are the ones displayed below?
2. Why is the suggestion to replace all 4 oxygen sensors instead of just replacing the 2 oxygen sensors for Bank 1? It seems like a waste of money to replace the Bank 2 oxygen sensors since I did not get a P0430.
3. After replacing the oxygen sensors and clearing my codes, if P0420 returns is the next step to replace the catalytic converter? It doesn't seem right that my cat converter has died after only 108K miles.
4. If I have to replace the catalytic converter, do I just replace the rear one? I read somewhere that there are 3 cat converters which I don't understand since I thought there was just 1 cat per bank.
5. I have seen suggestions to buy a kit to turn off VCM. I don't know much about this, I'll have to read more about it but it seems that there are strong opinions that if I don't turn off VCM, I will get repeat problems down the line. Not a question, just a statement since I know someone will mention turning off VCM.
6. I posted my Fuel Trim data below. Both banks seem really high. I'm not super smart on cars, can someone interpret what these values may suggest and how my P0420 code may be related? Thanks.
![156023]( "156023")
I had a CEL, using my BlueDriver Bluetooth OBDII Scanner, I pulled Code P0420 - "Catalyst System Efficiency Below Threshold Bank 1"
After reading a bunch of posts on this forum, the first suggestion seems to be to replace all 4 oxygen sensors even though the problem is likely the Catalytic Converter. My questions are below:
1. Can someone confirm that the 4 oxygen sensors I should buy are the ones displayed below?
2. Why is the suggestion to replace all 4 oxygen sensors instead of just replacing the 2 oxygen sensors for Bank 1? It seems like a waste of money to replace the Bank 2 oxygen sensors since I did not get a P0430.
3. After replacing the oxygen sensors and clearing my codes, if P0420 returns is the next step to replace the catalytic converter? It doesn't seem right that my cat converter has died after only 108K miles.
4. If I have to replace the catalytic converter, do I just replace the rear one? I read somewhere that there are 3 cat converters which I don't understand since I thought there was just 1 cat per bank.
5. I have seen suggestions to buy a kit to turn off VCM. I don't know much about this, I'll have to read more about it but it seems that there are strong opinions that if I don't turn off VCM, I will get repeat problems down the line. Not a question, just a statement since I know someone will mention turning off VCM.
6. I posted my Fuel Trim data below. Both banks seem really high. I'm not super smart on cars, can someone interpret what these values may suggest and how my P0420 code may be related? Thanks.
NTK 24435 {#36542R70A01, 36542R71L01} Info
Downstream Rear; Bank 1 Sensor 2; OE MFR: NTK |
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| NTK 24385 {#36531R70A02, 36541R70A01} 5-Wire Wideband Info FitsUpstream Front; Bank 2 Sensor 1; OE MFR: NTK orUpstream Rear; Bank 1 Sensor 1; OE MFR: NTK |
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