Code P0420 Cat Converter Efficiency?
#1
Join Date: Jul 2012
Location: Beautiful Pilot Mountain NC
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Code P0420 Cat Converter Efficiency?
My '07 XJR (90k miles) is showing a CEL, and DTC is P0420 "Bank 1 Cat Converter Below Efficiency Threshold"
I erased the code, but it comes back and flips on the CEL
Anyone else encountered this?
I searched the forum, and there are a couple threads about seafoam cleaning, etc, but only final resolution I read was to replace cat
Had a bad cat on my an 8 yr old Mercedes, and the dealer replaced it under (an EPA mandated?) 10 yr/100K mile emissions warranty. Does this maybe apply to our aging Jags?
I erased the code, but it comes back and flips on the CEL
Anyone else encountered this?
I searched the forum, and there are a couple threads about seafoam cleaning, etc, but only final resolution I read was to replace cat
Had a bad cat on my an 8 yr old Mercedes, and the dealer replaced it under (an EPA mandated?) 10 yr/100K mile emissions warranty. Does this maybe apply to our aging Jags?
#2
My '07 XJR (90k miles) is showing a CEL, and DTC is P0420 "Bank 1 Cat Converter Below Efficiency Threshold"
I erased the code, but it comes back and flips on the CEL
Anyone else encountered this?
I searched the forum, and there are a couple threads about seafoam cleaning, etc, but only final resolution I read was to replace cat
Had a bad cat on my an 8 yr old Mercedes, and the dealer replaced it under (an EPA mandated?) 10 yr/100K mile emissions warranty. Does this maybe apply to our aging Jags?
I erased the code, but it comes back and flips on the CEL
Anyone else encountered this?
I searched the forum, and there are a couple threads about seafoam cleaning, etc, but only final resolution I read was to replace cat
Had a bad cat on my an 8 yr old Mercedes, and the dealer replaced it under (an EPA mandated?) 10 yr/100K mile emissions warranty. Does this maybe apply to our aging Jags?
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hisport (04-04-2016)
#3
#5
Dealer may or may not assist, as it will depend on the Service Manager.
Last edited by Box; 04-04-2016 at 08:28 AM.
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hisport (04-05-2016)
#7
Join Date: Jul 2012
Location: Beautiful Pilot Mountain NC
Posts: 656
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Thanks Box
It was the RH cat in the only other forum thread I could find on P0420; perhaps susceptible?
I have an O2 socket, and will swap as you suggest
Have no misfire codes, etc, but this is a used car with unknown history. Seems to run well, and no oil consumption in the ~ 1500 miles home
Intake tube "dongle" was broken and leaking air downstream from the MAF, so fuel trim has been way off for some time. Maybe this was it, and caused a lean misfire
1 of 19: Do you see 8/80 emissions warranty for the '07? I have not researched...
It was the RH cat in the only other forum thread I could find on P0420; perhaps susceptible?
I have an O2 socket, and will swap as you suggest
Have no misfire codes, etc, but this is a used car with unknown history. Seems to run well, and no oil consumption in the ~ 1500 miles home
Intake tube "dongle" was broken and leaking air downstream from the MAF, so fuel trim has been way off for some time. Maybe this was it, and caused a lean misfire
1 of 19: Do you see 8/80 emissions warranty for the '07? I have not researched...
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#9
Thanks Box
It was the RH cat in the only other forum thread I could find on P0420; perhaps susceptible?
I have an O2 socket, and will swap as you suggest
Have no misfire codes, etc, but this is a used car with unknown history. Seems to run well, and no oil consumption in the ~ 1500 miles home
Intake tube "dongle" was broken and leaking air downstream from the MAF, so fuel trim has been way off for some time. Maybe this was it, and caused a lean misfire
1 of 19: Do you see 8/80 emissions warranty for the '07? I have not researched...
It was the RH cat in the only other forum thread I could find on P0420; perhaps susceptible?
I have an O2 socket, and will swap as you suggest
Have no misfire codes, etc, but this is a used car with unknown history. Seems to run well, and no oil consumption in the ~ 1500 miles home
Intake tube "dongle" was broken and leaking air downstream from the MAF, so fuel trim has been way off for some time. Maybe this was it, and caused a lean misfire
1 of 19: Do you see 8/80 emissions warranty for the '07? I have not researched...
https://www3.epa.gov/obd/pubs/420f15035.pdf
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hisport (04-06-2016)
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