P1275 Cel?

[edevlin]

I have been chasing a P1275 CEL code that I started getting when I put headers and 100-cell cats on the car. I replaced all 4 oxygen sensors at the same time that the headers/cats were installed.

Shortly after the installation I started getting the P1275 CEL code, which pointed us to low efficiency from the cats or oxygen sensors. We first checked the oxygen sensor wiring and it seemed to check out fine.

BTW, the car has had the CPU reprogrammed to take into account the headers and high-flow cats. The last time we looked we got the P1275 and it said the left bank was running at low efficiency. We then swapped both pre-cat and post-cat oxygen sensors on the left and right side and again got the P1275 saying the left bank was still bad.

That made us think it was a bad cat on that side, so we replaced the cat on that side last week, and again got the P1275 CEL, any ideas on what might be going on would be greatly appreciated,

Ed

[CJ_Boxster]

My guess (which is a good one) is that o2 sensors are experiencing large amounts of unburned fuel and or heat which headers and high flow cats usually will cause. Simple fix is to buy an Anti-Fouler from auto parts store which can fit your O2 sensor and thread into your header/exhaust system...

Drill a larger whole into the anti-fouler so that the head of the o2 sensor can thread all the way into the anti-fouler.

By installing this, you will be setting the o2 sensor back a bit out of the way of all the heat and gases and will likely eliminate your CEL issue.

I had to do this to my friends Acura RSX Type-s cause he bought a Header kit that eliminated the cats. The after-cat sensor required the anti-fouler in order to keep the CEL by O2 errors away.

[FrayAdjacent]

I think you might be chasing the wrong things.

The generic meaning of the OBDII P1275 code is:

P1275 Accelerator Pedal Position (APP) Sensor 1 Circuit

[CJ_Boxster]

Originally Posted by FrayAdjacent

I think you might be chasing the wrong things.

The generic meaning of the OBDII P1275 code is:

P1275 Accelerator Pedal Position (APP) Sensor 1 Circuit

Since his car is MY00, his OBDII codes are different than 97-99 OBDII codes

for him MY00, P1275 is - Ageing of oxygen sensor ahead of TWC, bank 1

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Edit:
Actually, even for MY97-MY99
P1275 is - Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below Lower Limit

Which means they are basically the same from MY97 - MY04

[FrayAdjacent]

So clear this up for me... when was the change to OBDII? Aren't all OBDII codes universal, thus the OBDII standard? Is his car OBD (I) not OBDII?


I'm confused.

[CJ_Boxster]

Originally Posted by FrayAdjacent

So clear this up for me... when was the change to OBDII? Aren't all OBDII codes universal, thus the OBDII standard? Is his car OBD (I) not OBDII?


I'm confused.

They are both OBDII, but on renntech.org, they have 2 different OBDII sections... one for MY97 - MY99, and one for MY00 - MY04 so i assume the P codes might differ slightly. In your case, its the same error message either way.