2008 Viper failed emissions

[z20ateU]

Quick question y'all.

Today I went to go take emissions and the car failed.

2 active codes, p0420 and p0430.

Those both relate to rear 02 sensor efficiency, which is prolly due to the high flow cats.
What is the easiest way to rectify this? I rarely lug the car around.

Of more concern is why my check engine light is not on. Is it possible that someone disabled the bulb in the dash, or does the bulb commonly burn out?

Car is an 08.

Thanks

[Steve M]

What else is done to the car? Have you owned it a while? Did you just pick it up? Do you have the stock PCM, or the Mopar PCM?

High flow cats will throw those codes. If you have active codes showing up, the check engine light should be on. Although it's not unheard of for a bulb to go bad, I'd consider it rare. There are better chances that something was done to keep it from turning on. What that something is is a bit tougher to answer, if not nearly impossible over the internet. The Mopar PCM would be my first guess. Kinda reminds me of this thread:

https://driveviper.com/forums/thread...ycle-for-Viper

[stugots2]

if the Check engine light is not on, its likely a stored code, might not even be a current existing issue, try clearing it and driving it a few miles

[z20ateU]

Car was last registered in California, so I don't think it has an aftermarket PCM. Car has high flow cats and a bellanger exhaust. The exhaust also snaps crackles and pops on decel so I don't think it has a Mopar ECU.

I gunna throw a reader on it today, clear the codes and drive it.

On my emissions form it says MIL staus is ON, which should illuminate the CEL on the dash.

I

[z20ateU]

The CEL also doesn't light up on key on as well.

[Steve M]

This seems to be a recurring theme. If it pops on decel, it could be the Mopar PCM with the Arrow reflash.

It is rare that someone would install headers without an aftermarket PCM, or aftermarket tuning.

[Steve M]

The CEL also doesn't light up on key on as well.

That's telling me someone either removed the bulb, or taped over it. Could also be burnt out I guess. It should come on key ON every time.

[z20ateU]

Stock Manifolds

[z20ateU]

I really don't want to pull the dash apart, but I guess I'm going to have to. FFS.

[Steve M]

Stock Manifolds

Copy that...misread when I saw Belanger. So just the high flow cats and Belanger mufflers.

I really don't want to pull the dash apart, but I guess I'm going to have to. FFS.

Yes...that's unfortunately the only way to get to that bulb to see what's going on.

[stugots2]

Bulb is out!!!

[z20ateU]

Seeing as how the car was delivered to my house with a California plate on it, I doubt it has an off road PCM.

I'm hoping it is two unrelated issues that are both easily resolved.

- - - Updated - - -

how bad is it to get to the gage cluster?

[Steve M]

how bad is it to get to the gage cluster?

Not hard, but not fun either. Pull gently...if it isn't coming out, double check and make sure you didn't miss any random fasteners. It's mostly held in with clips, but there are a couple screws sprinkled in as well.

[z20ateU]

I don't have to pull the center console or the radio and climate control bezels and drop the steering column?

[TrackAire]

The "high flow cats" are the issue....non of the single aftermarket units the size of a grapefruit will ever last as long as the twin stock system. I've noticed that after 2500 miles of driving, the aftermarket units loose efficiency in my Viper. No way to put 8 plus liters and 600 hp through those tiny cats and expect them to live long term IMO.

You gotta ask yourself if the small high flow units would last and work, why wouldn't Dodge use them? They will burn clean, but not for long.

How many miles are on the high flow cats?

[RedTanRT/10]

It takes 5-10 minutes to pull the ecu out. Take it out and look at the part number, then google that part number to see if it has the Mopar venom ECU or stock.

Have you asked the seller why it doesn't pass emissions? If it came from Cali it has to pass every 2 years.

[Steve M]

I don't have to pull the center console or the radio and climate control bezels and drop the steering column?

Yes to all of those. The entire center console thankfully doesn't have to come out (as that involves removing the rear waterfall panel), but you'll need to remove the part that surrounds the shifter.

[Steve M]

The "high flow cats" are the issue....non of the single aftermarket units the size of a grapefruit will ever last as long as the twin stock system. I've noticed that after 2500 miles of driving, the aftermarket units loose efficiency in my Viper. No way to put 8 plus liters and 600 hp through those tiny cats and expect them to live long term IMO.

You gotta ask yourself if the small high flow units would last and work, why wouldn't Dodge use them? They will burn clean, but not for long.

How many miles are on the high flow cats?

Agreed...they are just enough to clean up the exhaust smell, but they will never scrub as well as the factory cats.

[z20ateU]

I'll try some o2 extensions first to see if that fixes the issue.
If not.....
As long as I have a stock PCM, I'll just buy HP Tuners and fix the codes that way.


Thanks for all the help. Will keep you guys updated.