Hi guys,

I know there have been posts before about the engine light coming on. I recently had the RPW Headers installed with a 3" Cat back exhaust sytem. No long after this the engine light came on and has stayed on. I also note that Fuel Consumption has increased. I contacted RPW and they said that in 95% of cases the O2 Eliminators when installed will fix the problem. However, I seem to be one of the 5% where the problem is stilll there. The guy at RPW says there is nothing else that can be done. Has anybody else had this problem and were you able to fix it? Any suggestions?

People were having the same problem on the Ralliart Colts with a new exhaust. I know you only installed headers, but this might fix it.

What some people did were put some washers on the O2 sensor and too it out of the main path of flow, 99% of the time this fixed the CEL.

It might be worth a try, but keep in mind this is a different car.

Thanks but I did get a new 3" Cat back exhaust fitted as well with a great Berklee Muffler. I'll wait to hear from some other 380 owners and if no luck I'll take your advice to my exhauust guy.

The 380 is a very different car to the Colts, but it is possible the washers on the O2 sensors could fix it. Has anyone else heard of that being done?

The 380 is a very different car to the Colts, but it is possible the washers on the O2 sensors could fix it. Has anyone else heard of that being done?

They run a very similar ECU setup..

My brother has had the exact same issue with his Ralliart Colt and the washers were a simple fix.

Your other option is to get a diagnostic done with a MUTIII and find out exactly what it is..

SuFz :ninja:

Sorry, but the RPW oxygen sensor extenders are a load of horse ****.

They are a poor attempt at tricking the ECU, and they don't work a lot of the time.
When I emailed them with questions about the "new" oxygen sensor extenders and if anyone had suffered CELs, they were very coy in their response. Refused to give me a straight answer.

Got a PM from a Mitsubishi tech who used to work at Tonsley Park... He said if you want to guarantee no CEL, you need to install a cat converer in place of the Mitsubishi secondary one, and extend the wiring for the rear sensors down past there.

They are a poor attempt at tricking the ECU, and they don't work a lot of the time.

Thats the idea. A few mudguard washers do the same thing.

did RPW do everything for you? Take the car back and say you want a refund

why anyone would be happy paying for this result is beyond me................ youve taken a good smooth reliable, economic large car, and turned it into a piece of shit.

Surely there must be a way of using a resistor on one of the 2 sensors on each bank to then trick the return signal as such, ie the ECU gets a responding voltage back from the sensor to tell the air / fuel mix, it is looking for 2 specific values, give it those 2 values :)

When I fitted RPW extractors a few years ago (early versions before their so-called extended O2 sensor wiring kit) I extended the two rear oxygen sensors anyway (DIY wiring) and fitted 'spacers' about 50mm long, to take the sensors out of the direct exhaust gas flow, supposedly to fool them into thinking they were still sitting behind the stock cats.

But it didn't work, I still got CELs and a range of O2 sensor error codes.

I thought it might be down to the remaining 3rd cat being a 'white brick' and not a real cat, so I replaced it with an after-market 200 CPI metal cat. And then not long ago I put a full size Magnaflow 350 CPI cat in.

No difference, still heaps of O2 sensor error codes. Off the top of my head, P0140, P0141, P0160, P0161, P0056 and random others. All saying something to do with 'O2 sensor heater circuit' and similar according to my OBD2 scanner.

Wipe them using the scanner and a few ks later they are back again.

No effect on performance or fuel economy that I've ever been able to detect.

So following a tip from Foozrcool I pulled the instrument cluster out, separated the body from the face (easy, just pop a few clips), peeled back the face panel a little, and stuck a small piece of black foam in the slot where the CEL LED sits.

Hey presto, no more annoying CELs!

But I scan it once a week with the OBD2 scanner just to be on the safe side, in case a 'real' error code pops up.

RPW should be kicked in the backside for that kit.

it makes the exhaust system completely illegal and poisons every other motorist with cancerous gases.

Anyone who tries to simply defeat the CEL's with washers is no better than RPW.

call me an assole but...

If I smell a car on the road with no cat...and i do know what it smells like with no cat..then I always make the phone call to the EPA.

Surely there must be a way of using a resistor on one of the 2 sensors on each bank to then trick the return signal as such, ie the ECU gets a responding voltage back from the sensor to tell the air / fuel mix, it is looking for 2 specific values, give it those 2 values :)

is the ECU changing cam/fuel/spark timing based results of the first set of oxy sensors, or the last?

is the ECU changing cam/fuel/spark timing based results of the first set of oxy sensors, or the last?

From my experience, the first set. As I said in my earlier post, with all the error codes I get and even if the two rear O2 sensors are doing SFA, I've never detected any negative effect on performance or fuel economy. It's over three years now since I fitted the RPW extractors and honestly I still really have no idea if the two rear O2 sensors have ever worked properly or even at all ever since.

RPW should be kicked in the backside for that kit.

it makes the exhaust system completely illegal and poisons every other motorist with cancerous gases.

Anyone who tries to simply defeat the CEL's with washers is no better than RPW.

call me an assole but...

If I smell a car on the road with no cat...and i do know what it smells like with no cat..then I always make the phone call to the EPA.


in all fairness, its no worse than a falcodore built over 7 years ago with single set of sensors

all of your posts are really negative, did you join for an argument?

That sounds easy. I'l do that amd see what happens

Whoa,

Its obvious some people have very string feelings about RPW, as I have read a lot of negative posts about them and some of it seems to be justified.However, if you weren't the type of person to want to get the best out of your car and attempt to improve its performance to make it a more interesting drive/ride why would you bother being on a forum like this. By the way. I have spent thousands of $ upgrading the suspension, brakes wheels and tyres, so it isn't all about performance, rather the whole package including safety. Who doesn't like to see a car that money has been spent on driving down the road...not because people are posers but because they have a great deal of pride in their motors..... All I Wanted was some good advice about some issues not a tirade.

Cheers guys

in all fairness, its no worse than a falcodore built over 7 years ago with single set of sensors

all of your posts are really negative, did you join for an argument?

No he joined because he has been a member before quite a "star" of a member but was a "black" day when he left, several times in fact and has pissed many many people off with his double personality and his so called knowledge (which he pays everyone else for) :) Will leave you to guess who this mystery pain in the ass is :)

As for removing the 2 pre cats, Mits discovered early on in the process they were not even needed, they did not remove them clearly as the cost to delete would probably outweigh the cost to leave them there given that they would have to also submit documents for the change etc to the government for compliance.