sybar

Wondering if anyone knows if having a CEL on during an MOT is a failure?

As you may have guessed I have the CEL on and having read the code its:

P0135 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Heater Circuit Malfunction

Now my code reader also has some graph options for the likes of the throttle position, RPM and coolant temp etc along with a readout from the O2 sensor. This graph appears to show the sensor working (minor changes in the voltage while in idle only) so I'm assuming as the code refers to the heater circuit then I'm pretty safe for a while, until I have enough pennies for a new O2 sensor. This is a hard fault as it appears every time you start the car, despite clearing the code.

Only problem is my MOT has expired and before I fork out for an MOT which will fail due to the CEL I thought I'd better check the collective brains.

Thanks in advance for your advice.

GrittyShaker

It won't fail simply due to a CEL. The problem that has thrown the CEL might cause a failure though, if it's affecting the emissions or something. Could be wrong there, TBH. I'm not an expert.

I've had a CEL due to my secondary O2 sensor for a while now, and it has got through 2 MOTs without issue.

MB

The secondary sensor won't cause any emissions issues, but a faulty primary quite possibly will. Best way to test it is an emission mot test

NineBolts

Can't help much.. sorry

but the DVLA (or whatever they call themselves) have the test details on their site:
http://www.transportoffice.gov.uk/crt/doit...lsandguides.htm

It might not be a fail in itself but the cause of the CEL might also generate a failure on emissions or it might just make the inspector take a deeper look.

Ultra_Nexus

CEL will get you an advisory, but nothing else.

sybar

Thanks guys.

Will book it in and hope for the best on the emissions, as its only just gone faulty I should be ok

sybar

Just a quick update:

Got round to getting an MOT and passed with no hassel . As was said earlier the CEL on has no direct impact on the MOT but could have affected the emissions.

The best part is the light has gone out all on it own, not sure why but thats £168 saved or £300 in honda money.

thanks again peeps.

keith2.2

Confucious he say: CEL that goes by itself, comes back by itself

AdrianEagle

Have an ECU reset that may cure it. See Technical Section.

veehexx

ABS or Airbag lights are fails, aren't ECU lights too?
i thought they were...