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Old 6 Days Ago   #1
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Check engine light

Had check engine light come on our 1.2 (2009 UK)

Wife was driving at the time and felt it almost stalled and felt rough, two error codes come back. She stopped the car filled up with fuel as almost empty but at least 70 miles left, so wasnít running on 0 miles. After restarting the car it was fine but check engine light remained

P0120 - Throttle/Pedal position sensor
P0300 - Random/multiple cylinder misfire

Spark plugs were changed around 10 months ago, battery a year or so

Codes cleared and went for at least an hours drive and been fine, no misfires and worked as should.

I was thinking tomorrow to check all the ignition cables so check their condition, but if I remember correctly they looked like new condition (when I changed the spark plugs months ago)

Car has only done around 29K since new.

Iím guessing itís a wait and see if it happens again and check codes again, as I donít know if either of them are old stored codes or both happened at the same time.

Is there anything else I can visually check?

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Last edited by Danoid; 6 Days Ago at 01:59.
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Old 5 Days Ago   #2
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Re: Check engine light

I removed the ignition cables and look basically brand new visually, I removed two random spark plugs and they still looked new aswell as pr ably only covered around 600 miles since I put them in a few months ago.

I downloaded multiecuscan but my KKL lead I used on my old VAG didnít work, so need to buy an ELM327 instead.

When my friend cleared the code he plugged in his odb2 reader and used torque but iím wondering if it pops up again would multiecuscan give a more precise error?
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Old 5 Days Ago   #3
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Re: Check engine light

Yes.. I think so.

But I'd guess (hope) that the car just had some fuel starvation.

The on-board range calculator works off a little float that moves about 5cm between Full and Empty.. so the degree of precision isn't great. Then the car's brains takes that imprecise information and works out how many miles it can go, with that fuel and at the current mpg.

If you're rolling down a hill with an almost empty tank, the range will read higher than if you have 3 gallons in there and are driving up a steep hill. Also, range can increase while you're driving along, for the same reason.

I always subtract 50 miles from the range, to allow the brains some degree of error. I only once went below range "50".. at which point the display blanks out.. so you can see what the car thinks your chances are..

Touch wood that putting petrol in it is the end of it..


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Old 5 Days Ago   #4
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Re: Check engine light

Probably un related but replace the engine earth strap if not replaced
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Old 5 Days Ago   #5
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Re: Check engine light

Quote Originally Posted by Ralf S. View Post
Then the car's brains takes that imprecise information and works out how many miles it can go, with that fuel and at the current mpg.
There's a weird algorithm in the range computer. And if you think the 500 is imprecise, just try using the one in the 169 Panda. I've seen the predicted range go down by over 200 miles in five minutes!
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Old 4 Days Ago   #6
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Quote Originally Posted by John202020 View Post
Probably un related but replace the engine earth strap if not replaced
I checked that a few months back when I red rubbered the clutch slave cylinder to death and it was fine, a little bit crusty but then it is exposed
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Old 4 Days Ago   #7
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Quote Originally Posted by Ralf S. View Post
Yes.. I think so.

But I'd guess (hope) that the car just had some fuel starvation.

The on-board range calculator works off a little float that moves about 5cm between Full and Empty.. so the degree of precision isn't great. Then the car's brains takes that imprecise information and works out how many miles it can go, with that fuel and at the current mpg.

If you're rolling down a hill with an almost empty tank, the range will read higher than if you have 3 gallons in there and are driving up a steep hill. Also, range can increase while you're driving along, for the same reason.

I always subtract 50 miles from the range, to allow the brains some degree of error. I only once went below range "50".. at which point the display blanks out.. so you can see what the car thinks your chances are..

Touch wood that putting petrol in it is the end of it..


Ralf S.
Weíve certainly had it lower over the years so I donít think itís related, it could well be as itís not come back since.

Iíve been driving it today and again been fine, so easiest solution is iíve banned the wife from driving her own car
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