Just received my code reader and pulled out this one

P1607, which is a "Engine Control Module ECM/Powertrain Control Module PCM Internal Circuit Malfunction"?

What could have caused this? I was probably doing around 80mph when it came up and having only just filled up with Tesco 99 instead of V power as usual a few miles earlier(night before in fact).

The car was fully warmed up and this was after a bit of minor VTEC action.. the car drove perfectly fine afterwards too but with the CEL illuminated...

I've cleared the code now and its not returned after a 6-7mile cruise and short 1-2mile blast..

Anyone else ever seen this code? could it be a faulty ECU? or just a one off glitch?

Any help/advice appreciated

 

Put it down to a glitch for now - but always useful to check the code in case it comes back.

It won't be the fuel, both are of equal quality.

 

Yeah you mentioned that about the fuel before, and fwiw I used Tesco 99 90% of the time in my 200SX and had absolute faith in it (iirc it was tested as having better resilience to det but with a slightly lower calorific value to V power)..

Just thought it was worth a mention as it was the only real change that was made

 

As Mark says its probably a glitch, I can remember one bloke who had the same problem a few years back i presume it was okay because i cant recall he having any further problems.

 

Yep I seem to remember one like this.

Hoping it wasn't the one where there was corrosion in the wiring loom?

 

Cant remember really TBH, was it that 'al3x' bloke he caused quite a stir on the forum .

 

ouch.. better check my wiring! There was quite a bit of condensation in the cabin and a little moisture in the boot.. not had a moment to clean out the drains but passenger and drivers foot wells seem ok

 

Whilst your at you might as well clean the connections on the ECU with contact cleaner, i noticed on mine it was 'slightly' dirty a few years back when investigating a CEL code.

 

Just need a dry enough weekend now

ps. thanks for the help so far dudes your time is much appreciated

 

yeah so, she popped another CEL this evening

This time P0420 Catalyst System Efficiency Below Threshold

Now normally this wouldn't worry me, what with the car being de-catted a few weeks ago... but two CELs (albeit different codes) in such close proximity? Could there be an underlying problem? or is it pretty much a dead cert that its due to the decatting? The decat has a built in spacer for the o2 sensor, maybe i need to add an extra anti fowler for extra clearance?