Is this a new O2 sensor?

[John_B]

Been out for a little sunny evening bimble and got the EML & TC lights and limp-home come on again. (This ruins my theory that so far it only happened after long periods of motorway cruising).

Anyone familiar with these codes? (On a 1998 2.8 if that's relevant)

I'm happy to throw a new O2 sensor at it, but I just wanted to check with you knowledgeable folk first in case there was another likely cause

thanks in advance!

 

[ChrisD]

Been out for a little sunny evening bimble and got the EML & TC lights and limp-home come on again. (This ruins my theory that so far it only happened after long periods of motorway cruising).

Anyone familiar with these codes? (On a 1998 2.8 if that's relevant)

I'm happy to throw a new O2 sensor at it, but I just wanted to check with you knowledgeable folk first in case there was another likely cause

thanks in advance!


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The post-cat sensor is primarily used for diagnosing a degraded catalytic converter.
Since the diagnostic is tripped for both the sensing element and the heater, it would be worth visually inspecting for major damage to the sensor (e.g. impact damage) or to the wiring.

 

[John_B]

The post-cat sensor is primarily used for diagnosing a degraded catalytic converter.
Since the diagnostic is tripped for both the sensing element and the heater, it would be worth visually inspecting for major damage to the sensor (e.g. impact damage) or to the wiring.

Thanks Chris, I'll get under and have a look!

Possibly a dumb question - but when you say impact damage do you mean like debris on the road, or bits of cat breaking apart and hitting the sensor on the way through the exhaust? (Or both! )

cheers

 

[ChrisD]

I meant road debris - something that would give you a visual clue as to what has happened. Its somewhat unusual but not unheard of to have all elements of the sensor fail at once. You’d be replacing the sensor anyway for anything other than a wiring issue but that is at least one feasible cause. My initial comment about the purpose of this sensor was to give you an idea of the severity of this fault. i.e. not critical. Good luck with the investigation.

 

[John_B]

I meant road debris - something that would give you a visual clue as to what has happened. Its somewhat unusual but not unheard of to have all elements of the sensor fail at once. You’d be replacing the sensor anyway for anything other than a wiring issue but that is at least one feasible cause. My initial comment about the purpose of this sensor was to give you an idea of the severity of this fault. i.e. not critical. Good luck with the investigation.

Thanks mate, I wasn't too worried about severity, it only started happening a couple of weeks ago, but in that time I have done more than 2k miles. It's probably happened about 6 times in total and each time a quick restart clears it. It's more of an annoyance at this stage, however I would prefer to fix it!

I'll have a visual check of the sensor and attempt to chuck a new one in and see how we get on