Technical Engine Managemnt Light

[playboisoldier]

Hi everyone,

Was just wondering, does anyone know what sensor causes the engine management light to turn on ? Last time i took it to my mechanics, he done his scans and everything and said it was a sensor that cost around £70. At the time I wasn't too bothered but now I would really want it fixed. He checked out everything and its okay, except for that sensor. This was a few months back and my mechanics is on holiday. Does anyone know what it could be ?

 

[bredsticz]

ANY sensor can cause it to come on, what sensor did he say it was?

Most common is a lambda sensor

 

[playboisoldier]

That's the issue, he never said which one it is. But the car seems to be running fine at the moment( hope it stays that way ) no idea what it could be. Oh and he fixed the exhaust when he told me this, so it can be the sensor to do with the exhaust ?

 

[ST60SX]

That's the issue, he never said which one it is. But the car seems to be running fine at the moment( hope it stays that way ) no idea what it could be. Oh and he fixed the exhaust when he told me this, so it can be the sensor to do with the exhaust ?

If the lambda sensor is faulty, as long as your ECU has a decent trim memory (record of the best injection timings and mixture), your car will probably run ok in the short term.

I would definitely get it fixed though as there are very bad things that can happen with a too lean (not enough fuel) or too rich (too much fuel) mixture. These can include overheating and blown valves/pistons for the former and pre-ignition, high fuel consumption and carbon fouling for the latter.

The lambda sensor is the one sticking out of the exhaust, near the manifold. It's fairly easy to change it yourself if you get one with the correct connector; the main difficulty usually relates to the thing being fused into the exhaust due to heat.

EDIT: If you do it yourself you will still need someone to reset the error code associated with it as it won't automatically reset itself.

 

[playboisoldier]

Thanks for your reply, would this cost a lot to fix?

 

[easyrider81]

Best to find out if it's pre-cat or post-cat lambda first. Straightforward job in theory if the old lambda comes out fine it's a quick job so not expensive labour wise. Easy enough to do yourself though.

 

[shaun200765]

"EDIT: If you do it yourself you will still need someone to reset the error code associated with it as it won't automatically reset itself."

Hi mate. I wrecked my upstream Lambda sensor last year by spraying WD40 into the idle control valve and it really messed up the way it drove BADLY! In the end I unplugged the sensor whilst I got a new one as it drove much better like that.

The engine management light was on of course but once I popped in the new sensor the light went off straight away and (touch wood) its been brilliant ever since.

I dunno if yours will do the same but I have read that the system needs 3 driving cycles with no issues and it clears the logged fault code itself.

Please feel free to chime in anyone if I have that part wrong

 

[red]

If you need to reset the light (or see what's causing it), check this guide:

https://www.fiatforum.com/punto-gui...irbag-errors-mk2-tenner-laptop.html?p=2536784

red

 

[playboisoldier]

If you need to reset the light (or see what's causing it), check this guide:

https://www.fiatforum.com/punto-gui...irbag-errors-mk2-tenner-laptop.html?p=2536784

red

Was just looking at this, thank you. Seems very helpful, could you possibly give me a direct link to the right cable on ebay, if its not too much trouble. I don't want to pay for one and its the wrong one .