I had the error code P0135 come on last night which is P0135 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Heater Circuit Malfunction, It clears but comes straight back one within 3 seconds of the engine being started,

It says sensor one I thought with a Decat it would show sensor two? Or do I just have it wrong?

A friends Decat car has no CEL and he has been running his S like it well over a year now,

Just unlucky?

Can I do anything with the flashpro if it is just related to the Decat?

I would still like the CEL to work if anything is actually wrong rather then disable it all together though

 

I've got FlashPro and decat and no lights, so probably is the sensor. Quite common on Honda's IIRC.

 

Sensor 1 is before the catalyst, sounds like a broken wire or more likely a duff sensor.

 

Primary O2 circuit CEL code will be a duff sensor

If it's related to decat it'll usually be a secondary O2 sensor code and will show it as "efficiency below threshold"

HTH

 

Yup manifold sensor ie the primary O2 sensor. Just replaced mine with a second hand item which i happened to get from a friend, they're fairly expensive new.

 

O2 sensors are a consumable item that last 5 or 6 years, they wear out, yours has lasted 7 years lucky you. A second hand one that's say 5 years old isn't going to last long so is a false economy. There are cheaper alternatives than buying one from Honda.

 

The primary sensors are expensive.
But whatever you do, DO NOT BUY THEM FROM TEGIWA expecting to get a decent deal!!
They seem to sell dodgy sensors, i had two From them....neither worked...out of pocket £200
I should probably write a post about it as i feel i was royally shafted!

 

It's less then four with how long it's been off the road,

Is it safe to drive still just pot around to work and back, Bear in mind it's running the HKS supercharger kit if it's going to make a difference,

Any good aftermarket options then?

 

Safe to drive, the fueling will probably be out, you'll use more, but OK till you get it done. If you get an auto electrician to replace it you will have a warranty. If you do it yourself you will need a special socket to do so. Have a search I'm sure there are a few posts with recommendations, I think bosch was one of them.

 

The car goes into safe mode and will burn a little more fuel, it might feel crappy but otherwise its safe to drive. Mine was like this for quite some time