P0430 error code

Well for starters you can try replacing the oxygen sensor or cleaning it.

https://www.fixdapp.com/blog/p0430-code/

P0430 definition: Catalyst system efficiency below threshold (Bank 2).
Issue Severity: MODERATE– Extended driving with this code can cause internal engine damage.
Repair Urgency: Get this code fixed as soon as possible.
Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0430 code. This DTC can be triggered by a faulty catalytic converter or oxygen sensor, which can be caused by an engine misfire or rich/lean air-fuel ratio.

I understand that spark plug and ignition coil has been changed, but once again check these two parts over again. Sometime wrong spark plug brand can cause problem, so it has to be 2007 Nissan Quest brand. Examine the spark plug carefully. There should be no brown discoloration on white ceramic part end. Also check the hexagon nut if it was rubbing marking or grey powder substance on it. Make sure spark plug gap is correct.

On Ignition coil check the rubber boot that sit on the spark plug, it should not have any powder stuff on it. I don't know if you can buy just the rubber boot or you have to buy the entire ignition coil for 2007 Nissan Quest. It might need replacement.

Make sure fuel gas cap is closed properly.

Your catalytic converter is not as efficient as it used to be and the system has flagged it. It uses the o2 sensor after the cat to make that determination. This is the only role of this 2nd o2.

You can try replacing the o2 but in all likelyhood you need the cat replaced.

There are other less legal options as well depending on budget and if you ever want to sell. These range from removal of the cat (no etest anymore) to placing a spacer between the o2 and exhaust in order to fool the system into thinking the cat is more efficient than it is.

Our corolla has no cats because racecar and I will drive it into the earth. If the CEL bothers you, electrical tape is an excellent concealer

rosario99 wrote: ↑ Vehicle: 2007 Nissan Quest
Problem: Engine Check Light -- Error Code P0430

I've been having a rough time with my vehicle these past weeks. My previous post had me dealing with Spark Plugs + Ignition Coils and an Alternator.

The latest issue is ODBII error code P0430. Instead of taking it back into the mechanic I'm open to any recommended troubleshooting steps. Keep in mind i do not have any service manual.

What is your mileage?

I read your other thread and, frankly, I suspect the ignition coils and the spark plugs - I have never heard of "Bravex" and would never use anything other than trusted brands for either coils or plugs. Heck, I recently had a Denso coil that failed and it was practically new - and I would still trust Denso more than what you bought.

If your plugs and COPs (coils) aren't working well, you could have misfires or poor combustion and your O2 sensors would sense that and report it by throwing the code you have. FWIW, Autolite is an "okay" brand for plugs but I prefer Bosch, NGK, Champion, Denso, or AC Delco. But as long as the Autolites are properly gapped, they should work fine. If you still have your original coils, I would put them back in, check your spark plug gaps, reset your CEL and see if it comes back.

If your scanner supports a Mode 6 test, I would recommend that you run one and count the misfires - it won't take many misfires for your O2 sensors to report a problem. If you're lucky, you haven't messed up your cats. If your scanner doesn't support a mode 6 test, I would suggest that you get a scanner that does.

And congrats on taking the journey to learn about these things - you're going to be okay.

Sigh, i know you had your initial maintenance done at Canadian Tire. Your last thread mentioned you may take it there to ask if they can fix/correct their error. Hopefully they corrected the initial error and if not, I suspect it's still got to do with the spark plugs and ignition cool and now could be causing you further problems...

Others have already chimed in to help and they're all pathways so I won't add to it save for using that process of elimination... That is, redo to ignition coil and/or use better/more reputable spark plugs and see if this fixes these issues. Hopefully it's really just the spark plugs and/or ignition coils.

I'm typing this not as any indictment but for future other readers to learn from the experience to not rely on Canadian tire for any maintenance/service. Not even wiper replacement LOL...

Hope you get issues resolved soon. Good luck!

had the code on my 2011 Camry, replaced the cat, all was well after that

golferbowl wrote: ↑ Sigh, i know you had your initial maintenance done at Canadian Tire. Your last thread mentioned you may take it there to ask if they can fix/correct their error. Hopefully they corrected the initial error and if not, I suspect it's still got to do with the spark plugs and ignition cool and now could be causing you further problems...

Others have already chimed in to help and they're all pathways so I won't add to it save for using that process of elimination... That is, redo to ignition coil and/or use better/more reputable spark plugs and see if this fixes these issues. Hopefully it's really just the spark plugs and/or ignition coils.

I'm typing this not as any indictment but for future other readers to learn from the experience to not rely on Canadian tire for any maintenance/service. Not even wiper replacement LOL...

Hope you get issues resolved soon. Good luck!

Slightly OT but watched a couple - yes, it took two - CT techs try to change a customer's wiper blades in the parking lot last week. They were at it for at least 30 minutes and only had one done by the time I left.

Jimbobs wrote: ↑ Slightly OT but watched a couple - yes, it took two - CT techs try to change a customer's wiper blades in the parking lot last week. They were at it for at least 30 minutes and only had one done by the time I left.

After they finished, they probably discovered that they installed them on the wrong car...

Jigsaw wrote: ↑ had the code on my 2011 Camry, replaced the cat, all was well after that

Expensive fix?

Jimbobs wrote: ↑ Slightly OT but watched a couple - yes, it took two - CT techs try to change a customer's wiper blades in the parking lot last week. They were at it for at least 30 minutes and only had one done by the time I left.

I had problem taking wiper off my 2005 Civic, driver and passenger side. They can be jammed in pretty tight. Couple of months ago, I did my passenger side, it was in pretty tight. I would press the tab in or out but wouldn't budge. I nearly bent the wiper arm doing so. Youtube video say pull the tab out, tried it didn't work. So I tried pushing the tab in and in the end it finally worked. I am guessing here you would need to apply some kind of lube to make it slide off easily.(What's good to apply here?) My wiper had C type of arm.

The new wiper I brought was on sale at CT. Motomaster Hybrid wiper blade. This one was most easiest to put on then the previous brand I brought such as Michelin, Goodyear etc. You just hook it and press the clip to shut it.

MasterMK wrote: ↑ I had problem taking wiper off my 2005 Civic, driver and passenger side. They can be jammed in pretty tight. Couple of months ago, I did my passenger side, it was in pretty tight. I would press the tab in or out but wouldn't budge. I nearly bent the wiper arm doing so. Youtube video say pull the tab out, tried it didn't work. So I tried pushing the tab in and in the end it finally worked. I am guessing here you would need to apply some kind of lube to make it slide off easily.(What's good to apply here?) My wiper had C type of arm.

The new wiper I brought was on sale at CT. Motomaster Hybrid wiper blade. This one was most easiest to put on then the previous brand I brought such as Michelin, Goodyear etc. You just hook it and press the clip to shut it.

Understood but they're technicians so presumably have some training or, at least, practice in doing this. You might do it once or twice a year. Anyway, this is OT so ....

https://www.amazon.ca/dp/B07GYJP9X9/ref ... SR7X539BSY

Install one of these and call it a day.

Notsojdmgc4 wrote: ↑ https://www.amazon.ca/dp/B07GYJP9X9/ref ... SR7X539BSY

Install one of these and call it a day.

Agree.

Nissan's are notorious for this crap. A spacer will make it easy and the code goes away. Saves you from buying an o2 sensor or replacing a cat.

Jimbobs wrote: ↑ Expensive fix?

had it done in 2017, $300 parts from Rockauto and $100ish labour at Hwy 7 / Bullock area mechanic in Markham.

I would try to replace sparkplugs with OEM ones. I watch numerous Toyota videos where people don't use original spark plugs to save a few bucks and have issues. Also replace the 02 sensor with original supplier as well, it's usually a half hour job for a mechanic. I ordered both fuel ratio and 02 sensor for my corolla recently and had mechanic charge me for one hour of labour. I ordered parts from RockAuto.

The OP shouldn't invest in an O2 sensor or a cat or an O2 sensor extender until the coils and plugs are swapped out.

Jigsaw wrote: ↑ had it done in 2017, $300 parts from Rockauto and $100ish labour at Hwy 7 / Bullock area mechanic in Markham.

I think I know this mechanic! I’m prolly the only one to drive a good ol RDX (over 10yr old) to him for servicing ☺︎ Granted there’s other repair shops there too but... I think this guy highly recommended in rfd too haha

CaptSmethwick wrote: ↑ The OP shouldn't invest in an O2 sensor or a cat or an O2 sensor extender until the coils and plugs are swapped out.

Sure if you want to waste time and money on a 15 yr old vehicle.

His/her butt dyno would feel if the coils or plugs are bad. A misfire capable of plugging up a cat would certainly be noticeable.

Your cat is going bad OP. There have been numerous solutions posted from 'proper' to 'improper' all will get you on the road in various states of emission compliance

esoxhntr wrote: ↑ Sure if you want to waste time and money on a 15 yr old vehicle.

His/her butt dyno would feel if the coils or plugs are bad. A misfire capable of plugging up a cat would certainly be noticeable.

Your cat is going bad OP. There have been numerous solutions posted from 'proper' to 'improper' all will get you on the road in various states of emission compliance

Did you read his other thread?