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Old 30th Jun 2008, 18:13   #1
DevilsAdvocate
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ST170 Engine Management Light

Hi Folks,

Went to view a Focus ST170 this evening, all seemed well enough except the Engine management light was on. The chap selling it said it was due to the battery going flat before hand and because it had detected low volts, the light had lit up. Sound genuine enough? What other possible problems could there be? And what costs involved?

The chap said he'd get it reset, but I don't want it coming back on again the minute I drive away! Thanks guys.

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Old 30th Jun 2008, 18:48   #2
Defcon5
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Sounds possible, but then again it could be something major

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Old 30th Jun 2008, 18:51   #3
DevilsAdvocate
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The car drove fine on the test, no knocks and it pulled well. Have read online about possible Lambda sensor failure causing this, expensive fix?

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Old 30th Jun 2008, 18:58   #4
lordrobs
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Quote:
Originally Posted by DevilsAdvocate View Post
Hi Folks,

Went to view a Focus ST170 this evening, all seemed well enough except the Engine management light was on. The chap selling it said it was due to the battery going flat before hand and because it had detected low volts, the light had lit up. Sound genuine enough? What other possible problems could there be? And what costs involved?

The chap said he'd get it reset, but I don't want it coming back on again the minute I drive away! Thanks guys.
The guy is selling his car with a fault light on the dash and claims its for a genuine reason and can simply be reset... so instead of getting it reset he just leaves it so potential buyers think twice about the car.

Either he is a plank or he's got something to hide, either way- walk away.

IMO of course

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Old 30th Jun 2008, 19:11   #5
Firegod
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Engine Management light I'd say was the lambda also. But if it's anything like the Fez it can take awhile to clear, unless taken to Fords and they can reset it for you. Because I have a sports-cat I had to get a MIL-Eliminator to get the light to turn off for me.

I guess if the cat was knackered it would also come on?

I wouldn't say battery though...

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Old 30th Jun 2008, 19:29   #6
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The car drove fine on the test, no knocks and it pulled well. Have read online about possible Lambda sensor failure causing this, expensive fix?
We had one in at work a few months back with the same thing, we kept on putting the light out but it would come on again after a few days to a few weeks. Even after fitting a new 02 sensor i think the light actually came on once more for the same thing before they finally chopped it in for an A3...

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Old 30th Jun 2008, 20:57   #7
SoliD
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Leave it alone, I would not buy one with engine light on unless it had been diagnosed and was due to be fixed before buying.

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Old 30th Jun 2008, 21:08   #8
Goliath
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Walk away from it. Seriously. Don't even go there. There are rafts of them knocking about (a quick search on Pistonheads reveals 8 pages worth) so you can afford to be picky.

Apart from anything else, if the battery is not charged/charging properly it's the battery warning light that comes on, not the engine management light.......

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Old 30th Jun 2008, 21:10   #9
Overlag
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Quote:
Originally Posted by DevilsAdvocate View Post
Hi Folks,

Went to view a Focus ST170 this evening, all seemed well enough except the Engine management light was on. The chap selling it said it was due to the battery going flat before hand and because it had detected low volts, the light had lit up. Sound genuine enough? What other possible problems could there be? And what costs involved?

The chap said he'd get it reset, but I don't want it coming back on again the minute I drive away! Thanks guys.
it could mean anything really. id walk away plenty of other ST170s about?

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Old 30th Jun 2008, 21:11   #10
ethos
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Or if you are keen.... get him to include a diagnostic session with ford? It MIGHT be something that simple.
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Old 30th Jun 2008, 21:17   #11
Duke
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Could also be ABS sensor. Had that with my Puma anyway.

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Old 30th Jun 2008, 21:21   #12
Torch [P4]
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a dead battery wouldnt throw up a fault code, however if a sensor were unplugged and then the engine started it would throw a code into the ecu which has its own battery backup
having experienced this first hand recently its a royal pita as you need to first read the code and then delete it to see whether or not it comes back.

could be genuine enough tho, if you are genuinely interested get him to take it to a main ford dealer and get the codes read and reset (cost me 30 to have an airbag fault code cleared on my old focus after a false trigger)


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