Help/advice with CEL for cat 08 base!!
09-05-2015, 01:54 PM
#1
Help/advice with CEL for cat 08 base!!
So I Went to the dealer for oil change and to get my cel checked
Code coming back is P0420
The service tech told me it's the cat (bank 3) and quoted me about $1,400
Can I Just get an aftermarket high flow cat to fix my problem or does anyone have any suggestions? Im Just trying to figure out the best route to take, I don't really want to shell out 1400 but I need to pass inspection by the end of the month.
Thanks In advance!
-Jimmy
Code coming back is P0420
The service tech told me it's the cat (bank 3) and quoted me about $1,400
Can I Just get an aftermarket high flow cat to fix my problem or does anyone have any suggestions? Im Just trying to figure out the best route to take, I don't really want to shell out 1400 but I need to pass inspection by the end of the month.
Thanks In advance!
-Jimmy
09-05-2015, 02:40 PM
#2
Suzuka Master
replace the O2 sensor prior to replace the CAT, I had similar experience in my Accord and dealer asked for $1100 to replace the cat but in reality the 02 sensor is the problems.
09-05-2015, 04:34 PM
#5
I'm thinking I'll just change the 2 sensors on the the motor bank 1 and 2
09-06-2015, 07:18 AM
#6
Maybe translation interpretation.
There are only 2 banks on the TL, but a 3 way catalytic converter.
P0420 is bank 1, firewall side, downstream sensor. This sensor tracks the cat efficiency by monitoring the exhaust after the cat.
With proper equipment, one can track the working of the O2 sensor to see if it's operating properly, but I'd replace the downstream senor (after cat) first. If that doesn't work, and the cat is deemed the problem, you can do an aftermarket install, but I don't have high hopes for inexpensive aftermarket cats working long term.
If the cat is bad, one can use 2 spark plug non foulers.
Place the first in the exhaust, then the second after the bottom is opened up so as the O2 sensor can be installed and not hit bottom, then install the O2 sensor.
I'll add, this is illegal.
There are only 2 banks on the TL, but a 3 way catalytic converter.
P0420 is bank 1, firewall side, downstream sensor. This sensor tracks the cat efficiency by monitoring the exhaust after the cat.
With proper equipment, one can track the working of the O2 sensor to see if it's operating properly, but I'd replace the downstream senor (after cat) first. If that doesn't work, and the cat is deemed the problem, you can do an aftermarket install, but I don't have high hopes for inexpensive aftermarket cats working long term.
If the cat is bad, one can use 2 spark plug non foulers.
Place the first in the exhaust, then the second after the bottom is opened up so as the O2 sensor can be installed and not hit bottom, then install the O2 sensor.
I'll add, this is illegal.
Last edited by Turbonut; 09-06-2015 at 07:21 AM.
The following users liked this post:
NJALLDAY57 (09-15-2015)
09-06-2015, 10:40 PM
#7
Maybe translation interpretation.
There are only 2 banks on the TL, but a 3 way catalytic converter.
P0420 is bank 1, firewall side, downstream sensor. This sensor tracks the cat efficiency by monitoring the exhaust after the cat.
With proper equipment, one can track the working of the O2 sensor to see if it's operating properly, but I'd replace the downstream senor (after cat) first. If that doesn't work, and the cat is deemed the problem, you can do an aftermarket install, but I don't have high hopes for inexpensive aftermarket cats working long term.
If the cat is bad, one can use 2 spark plug non foulers.
Place the first in the exhaust, then the second after the bottom is opened up so as the O2 sensor can be installed and not hit bottom, then install the O2 sensor.
I'll add, this is illegal.
There are only 2 banks on the TL, but a 3 way catalytic converter.
P0420 is bank 1, firewall side, downstream sensor. This sensor tracks the cat efficiency by monitoring the exhaust after the cat.
With proper equipment, one can track the working of the O2 sensor to see if it's operating properly, but I'd replace the downstream senor (after cat) first. If that doesn't work, and the cat is deemed the problem, you can do an aftermarket install, but I don't have high hopes for inexpensive aftermarket cats working long term.
If the cat is bad, one can use 2 spark plug non foulers.
Place the first in the exhaust, then the second after the bottom is opened up so as the O2 sensor can be installed and not hit bottom, then install the O2 sensor.
I'll add, this is illegal.
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09-15-2015, 08:17 PM
#8
so i passed inspection by using the scanner, clearing code and waiting until systems were ready and now i would like to actually fix the problem.
i purchased a used cat and O2 sensors for the rear ( bank 1 ) from a member, however it is from a 07 type S and mine is a 08 BASE.
can anyone confirm wether or not they are interchangeable? (before i spend hours tearing the car apart)
i tried searching on oemacuraparts but after a 14 hour work day everyday all these part numbers start mushing together :/
i purchased a used cat and O2 sensors for the rear ( bank 1 ) from a member, however it is from a 07 type S and mine is a 08 BASE.
can anyone confirm wether or not they are interchangeable? (before i spend hours tearing the car apart)
i tried searching on oemacuraparts but after a 14 hour work day everyday all these part numbers start mushing together :/
09-15-2015, 08:38 PM
#9
Senior Moderator
so i passed inspection by using the scanner, clearing code and waiting until systems were ready and now i would like to actually fix the problem.
i purchased a used cat and O2 sensors for the rear ( bank 1 ) from a member, however it is from a 07 type S and mine is a 08 BASE.
can anyone confirm wether or not they are interchangeable? (before i spend hours tearing the car apart)
i tried searching on oemacuraparts but after a 14 hour work day everyday all these part numbers start mushing together :/
i purchased a used cat and O2 sensors for the rear ( bank 1 ) from a member, however it is from a 07 type S and mine is a 08 BASE.
can anyone confirm wether or not they are interchangeable? (before i spend hours tearing the car apart)
i tried searching on oemacuraparts but after a 14 hour work day everyday all these part numbers start mushing together :/
09-17-2015, 08:48 PM
#11
Senior Moderator
09-18-2015, 06:57 AM
#12
36542-RDA-A01 SENSOR, RR. SECONDARY OXYGEN 07 - 08 TL
Plus aftermarket O2 sensor catalogs indicate that they are different.
But then again, the cats have different part numbers also.
Last edited by Turbonut; 09-18-2015 at 07:09 AM.
09-21-2015, 10:19 AM
#13
I was struggling with the same problem for years as I have an 08 base TL. I asked my mechanic about the spark plug defouler trick, partcost me about $9 and no CEL light since he put the defouler in. It has been 2 years with no CEL relating to p0420. No noticeable gas difference or anything like that. It just feels nice to not see the CEL light 24/7 lol. So ask your mechanic about it and if he don't know then you got a shitty mechanic.
09-26-2015, 07:33 PM
#14
I was struggling with the same problem for years as I have an 08 base TL. I asked my mechanic about the spark plug defouler trick, partcost me about $9 and no CEL light since he put the defouler in. It has been 2 years with no CEL relating to p0420. No noticeable gas difference or anything like that. It just feels nice to not see the CEL light 24/7 lol. So ask your mechanic about it and if he don't know then you got a shitty mechanic.
09-26-2015, 08:32 PM
#16
Example:
NAPA AUTO PARTS
NAPA AUTO PARTS
09-28-2015, 07:14 PM
#18
Yes exactly! I don't have bad gas mileage either it's just annoying to see the light pop on. I may just go that route because I'm not sure if I can put the cat and sensors I bought from a member on without any issues and my free time to screw around with it is beyond limited.
09-29-2015, 08:24 AM
#19
In a nutshell, the post cat, or downstream O2 sensor doesn't affect the fuel mileage as it's primary function is to monitor the exhaust after the cat does it's job, but, if the voltage becomes too high, caused by high oxygen content, the CEL will light indicating converter bad.
09-29-2015, 08:30 AM
#20
Does the light come on and stay on or does it go off and come back time to time?
Try clearing the code and seeing if it comes back. The bluetooth OBD readers are crucial for monitoring things like this.
Bank 1 cat is the hardest to replace.
Try clearing the code and seeing if it comes back. The bluetooth OBD readers are crucial for monitoring things like this.
Bank 1 cat is the hardest to replace.
10-13-2015, 08:25 AM
#22
3rd Gear
Join Date: Aug 2015
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I'm having the same issue... My CEL came on about two weeks ago and it turned out to be p0420 but it went off after a few days of driving. Well I was driving to work this morning and my CEL came back on. I haven't been able to check the code yet but i'm betting it's gonna be the same code. Also it's been raining off and on for a few weeks. The cel only comes on after it's been raining. I don't know if that has anything to do with it or not. I have a 2004 TL base.
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