I have a MY02 with a replacement up pipe, when cruising at light throttle for more than a few minutes the check engine light comes on, Deltadash shows p0546 (egt sensor circuit high input).

Does anyone know where the cheapest place is to get a new sensor and if it's a DIY job to change it?

Cheers

Edward.

 

Claim under Warranty if its an MY02, dont take any cr#p from the dealers as youve fitted a de-cat up-pipe, i know of 2 MY01 cars that have had this problem, mine being one of them and mine is awaiting the clearance to be completed and the other one is being done this week.
The EGT sensor is a known weak point on the Bugeye model and can fail with or without an up-pipe de-cat.

Zippy

 

How many miles have you done??

 

This means lower EGTs for some long period due to free flowing exhaust - up pipe in your case. I am sure the problem doesn't exist when you thrash the car, right? You can use a 2.2 K resistor in place of the EGT without problems, but ask the professionals for more details.
JIM

 

I'm sorry chaps but changing the up-pipe and hence removing the catalyst can have a detremental effect on the EGT sensor which will cause this sort of failure. Your dealer will quite rightly refuse a warranty claim.

Mike

 

Mike Wood

But how come Zippy has had an EGT failure without the change of an up-pipe???

 

That's entirely possible, changing the up-pipe makes it more probable in our experience.

The fact still remains that the car has been modified from std and therefore should not be covered by warranty for this sort of failure in my opinion.

Mike

 

Guys Mike is right, this is a known problem on the Bugeye model with the EGT sensor being prone to failure BUT it tends to happen a lot quicker with a de-cat up-pipe.
You are correct my car has the original exhaust system and it has still failed.
Ohh well at least i will get the Forrester again while its being done.

Zippy

 

Thanks for all the replies.

My car has done 11k miles, it has a decat up pipe, decat downpipe, sports catalyst and back box (Power engineering supplied). It also has a Ecutek remap.

I have run the car for about 5000 miles since the new exhaust / remap without any problems. I recently got a catalyst efficiency code when cruising on light throttle.

I sent the ECU to Ecutek who remapped the ECU to help prevent the cat. efficiency code. Since getting the ECU back I have had one cat efficiency code and a few egt probe codes, I only ever get these when I’m on very light throttle for a period of time (i.e. motorway at 80 – 85mph).

This isn’t a criticism of Ecutek, they have been very helpful, but it’s a 600 mile round trip to take my car to them, so if the egt probe is knackered I would rather sort it out myself.

The car is an EU import so I don’t expect to get the sensor swapped under warranty.

Jim, when I spoke to Ecutek / Power engineering, they said that the had come across a few failures of the egt probe, they now fit the probe at the top of the downpipe which gives readings about 150 degrees lower.

Cheers

Edward.

 

Edward.

Have you also got a cel fix?

Jim, when I spoke to Ecutek / Power engineering, they said that the had come across a few failures of the egt probe, they now fit the probe at the top of the downpipe which gives readings about 150 degrees lower.

Is this the equivalent of the 2kw resistor?? If so, how much is this to perform?

 

BL, I don't have the CEL fix as I have sports catalyst.

E.

 

Mike,

what happens if I leave the Check engine light on and don't replace the EGT sensor. Do I incur in problems?

 

Maybe you can get a sensor from a wrecked car?

 

If you do not replace the EGT sensor you whole car will come to a HALT!!!

I would get it changed.

However, there is a way round replacing the EGT sensor. The EGT sensor costs about £45 + labour to change it. The replacement way is to use 2 kw resistor with costs about 50 pence from maplin

 

just stick a 2.2k ohm resistor in it, it causes the ecu to see a steady egt and think everythings ok, works flawlessly. Sticking another egt probe in the uppipe is just asking for another egt probe failure.

 

Caronte

If you are lucky then the ECU can go into limp home mode where it won't run at anything above atmospheric pressure. If you are unlucky the end falls off the probe and it goes through the turbo.........

 

We have diagnosed more failures in standard up pipes (6) than we have seen in aftermarket up pipes (2) and in all cases except one, the sensor had simply died or was working with reduced sensitivity. The only one that had any signs of being damaged by the heat was in an OE catted up pipe. This does not surprise me as the temperature of the gas leaving the cat is substantially higher than if the cat is not there.

It is interesting that Subaru have removed this cat from the 03.

It is also interesting that I do not know of anyone that has had one fail once it has been replaced.

I have never heard of one breaking off and going through the turbo.

 

Sorry Pete,

but then I'm the only exeption.
I fully decatted mine and after 2000 miles it failed.
I came then to visit you and you replaced it with a new one that lasted 5000 miles before dying again.

However the car works fine up tyo now.

So what shall I do?

A.

 

Pete

Mine went today for the 2nd time

Is there an uprated sensor yet ?

Where does this resistor thingy go to essentialy remove the EGT sensor?

Nathan..

 

[trundles off to stanf in the "corrected" corner]

The resistor goes into the plug that connects to the sensor's lead. I've not looked at any alternatives for this sensor.

 

Thanks for all the replies.

Is it possible that my sensor is OK, but the ECU is seeing a lower than expected temperature when I'm cruising on very light throttle?

Also how easy is it to change the EGT sensor?

Cheers

Edward.

 

Pete

Not seen any 03MY WRX without cat in the up-pipe yet..........

I have days when I wish I hadn't said anything as well

Happy Birthday if I don't speak to you before then!!


Regards

Mike

 

One of those days... and another one today

Thanks Mike

 

Okay you've been stood there long enough now, out you come

Pete

Is it just a case of disconnecting the sensor and placing the resistor across the two pins of the plug and soldering them?

Do you remove the sensor entriely and blank off the hole in the exhaust ?

Could I pop in and get this done ?

Cheers mate

Nathan..

 

I'd also be interested in the resistor fix having had a warranty refusal for my failed EGT (which was a real saga, although Pete came to my rescue and was excellent in sorting stuff out including flat bedding my car to Basildon). Anyone know how to do it properly.

LoFi

 

If someone can tell me how to do this, what resistor to use etc. I'll do a photo guide.

Nathan..

 

I recall I did mention this to Pete and he said "Mmmmm, no, you need the EGT". A photo guide would be excellent. It just worries me that at any moment the car may become undrivable again.

LoFi