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Frankie Chou



Member Since: 18 Dec 2014
Location: To Kwa Wan
Posts: 3
Hong Kong 2008 Defender 110 Puma 2.4 SW Caledonian Blue
Fault Code 4021 ....
Shocked
Hi everyone, got a question want to share...
My DEFENDER is 2008 PUMA ... the ABS n TC light never turn off.
Diagnostices tellme the Fault code is 4021,which is failure of the Throttle Position Signal -CURRENT .
What i suppose to do? do i need to change any parts?
Thanks
Post #380021 18th Dec 2014 6:00pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610
United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
There is an accelerator position sensor which has 6 wires going to it down by the pedals. Check the connector and it's corresponding connector on the Engine Control Module for starters. If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #380027 18th Dec 2014 6:12pm
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Frankie Chou



Member Since: 18 Dec 2014
Location: To Kwa Wan
Posts: 3
Hong Kong 2008 Defender 110 Puma 2.4 SW Caledonian Blue
Thank you.. will try it ...
but i have got the other problem is .. when i use the diagnostic computer to clean the fault code.. yes it works, but when i drive the vehicle forward or backward, the TC light always suddenly on and off, also the ABS pump turn on as well.. coz i heard the sound from ABS pump for sure. At the same moment .. the left front wheel is locked by ABS pump, the steering wheel just turn left by itself.... also the break pedal has got vibrateion.
Is it same problem with the accelerator position sensor ?
Post #380038 18th Dec 2014 6:41pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610
United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Have a look through this thread it may help. Thumbs Up

http://www.defender2.net/forum/topic2394.h...termittent If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #380046 18th Dec 2014 6:59pm
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Frankie Chou



Member Since: 18 Dec 2014
Location: To Kwa Wan
Posts: 3
Hong Kong 2008 Defender 110 Puma 2.4 SW Caledonian Blue
Thumbs Up THANK YOU SO MUCH!! u got facebook?
Post #380059 18th Dec 2014 8:08pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610
United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
No....Social media apart from this forum I do not partake in. It eats your life. Whistle Thumbs Up If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #380078 18th Dec 2014 9:17pm
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