'00 S70 P1670 Code (Bad Immobilizer)

Striker01 · Apr 17th, 2010, 19:19

Hey Folks,

I recently received this car as a company demo, it's a super clean 2000 Volvo S70 SE Automatic with just under 100,000km's. We took it in as a trade in on a brand new car.

Well, I'm thinking of purchasing the car as it's cheaper for me in the long run than having to pay the dealership demo allowances. The car drives fantastic! Smooth, no foreign noises, clunks, rattles etc. It's a great commuter car for me.

However, a couple days ago, the check engine light randomly came on. After checking the codes, its code P1670 which after doing some research is a bad immobilizer and could be a couple things. The car drives and start 100% fine.

I did find an interesting post by a forum member on here that I tried to PM but being a newb, I can't do this. He mentioned that I could possibly clean some sort of contacts, located under the sterring wheel that may fix this issue?

If anyone can give me some advice, its greatly appreciated.

Chris_Rogers · Apr 17th, 2010, 20:21

http://www.volvoforums.org.uk/showth...hlight=antenna

Striker01 · Apr 17th, 2010, 21:35

You where the guy I tried PM'ing twice Chris. I wanted to know exactly where the spot was you mentioned that I could try and clean up

Also-the car starts perfectly fine and runs the same. No stalls, no hard time starting, once again.

Chris_Rogers · Apr 18th, 2010, 07:49

The antenna ring is the illuminated plastic part (with a coil in it) that is round the lock barrel, it's obvious once you have removed the lower cover.

The problem seems to be dissimilar metals used for the connector.

I've found that some aggessive cleaning of the coil end is required, I used a diamond file, plus the use of contact grease for a lasting connection.

Clan · Apr 18th, 2010, 08:13

The contact problem is on the Immobilser control unit pins , volvo do a short red lead with a terminal connector on which has a tighter grip so it is an easy matter of cutting each wire in turn and soldering on this short fly lead , you need 8 or them ...

Chris_Rogers · Apr 18th, 2010, 08:56

Yes, but the problem is at both ends.

The antenna end is usually the first to go, I'd suggest tackle that end first and the immobilizer end only if you have to.

Clan · Apr 18th, 2010, 09:10

I've always done both mods at the same time to prevent any further problems , new antenna ring and the terminal mod , never had a comeback .. however perhaps the problem with the antenna ring is the connector rather than the coil of ultra fine wire in the antenna ring ... Initialy from 1998 the antenna ring change cured the problem , then in later years the immobiliser pin connectors gave problems too .

Chris_Rogers · Apr 18th, 2010, 09:34

I expect you're correct, I can only go by my experience.

I found the problem was the connector pins on the antenna, I found a hard whitish coloured corrosion on the pins, probably aluminium oxide. This has to be removed to get a good connection at the radio frequency used. I dab of contact grease will help prevent reoccurance.

Striker01 · Apr 19th, 2010, 23:22

I'm gonna look into this on the weekend to see if I can figure it out. I know that I don't see anything glowing around the ignition at night but once again, the car does start and drive perfect (knock on wood)

Apr 17th, 2010, 19:19	#1
Striker01 New Member Last Online: Apr 19th, 2010 23:22 Join Date: Apr 2010 Location: Ontario	'00 S70 P1670 Code (Bad Immobilizer) Hey Folks, I recently received this car as a company demo, it's a super clean 2000 Volvo S70 SE Automatic with just under 100,000km's. We took it in as a trade in on a brand new car. Well, I'm thinking of purchasing the car as it's cheaper for me in the long run than having to pay the dealership demo allowances. The car drives fantastic! Smooth, no foreign noises, clunks, rattles etc. It's a great commuter car for me. However, a couple days ago, the check engine light randomly came on. After checking the codes, its code P1670 which after doing some research is a bad immobilizer and could be a couple things. The car drives and start 100% fine. I did find an interesting post by a forum member on here that I tried to PM but being a newb, I can't do this. He mentioned that I could possibly clean some sort of contacts, located under the sterring wheel that may fix this issue? If anyone can give me some advice, its greatly appreciated.

Apr 17th, 2010, 21:35	#3
Striker01 New Member Last Online: Apr 19th, 2010 23:22 Join Date: Apr 2010 Location: Ontario	You where the guy I tried PM'ing twice Chris. I wanted to know exactly where the spot was you mentioned that I could try and clean up Also-the car starts perfectly fine and runs the same. No stalls, no hard time starting, once again. Last edited by Striker01; Apr 17th, 2010 at 21:38.

Apr 18th, 2010, 08:13	#5
Clan Experienced Member Last Online: Yesterday 16:06 Join Date: Jun 2007 Location: L/H side	The contact problem is on the Immobilser control unit pins , volvo do a short red lead with a terminal connector on which has a tighter grip so it is an easy matter of cutting each wire in turn and soldering on this short fly lead , you need 8 or them ... __________________ My comments are only based on my opinions and vast experience .

Apr 18th, 2010, 09:10	#7
Clan Experienced Member Last Online: Yesterday 16:06 Join Date: Jun 2007 Location: L/H side	I've always done both mods at the same time to prevent any further problems , new antenna ring and the terminal mod , never had a comeback .. however perhaps the problem with the antenna ring is the connector rather than the coil of ultra fine wire in the antenna ring ... Initialy from 1998 the antenna ring change cured the problem , then in later years the immobiliser pin connectors gave problems too . __________________ My comments are only based on my opinions and vast experience .

Apr 17th, 2010, 20:21	#2
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	http://www.volvoforums.org.uk/showth...hlight=antenna

Apr 18th, 2010, 07:49	#4
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	The antenna ring is the illuminated plastic part (with a coil in it) that is round the lock barrel, it's obvious once you have removed the lower cover. The problem seems to be dissimilar metals used for the connector. I've found that some aggessive cleaning of the coil end is required, I used a diamond file, plus the use of contact grease for a lasting connection.

Apr 18th, 2010, 08:56	#6
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	Yes, but the problem is at both ends. The antenna end is usually the first to go, I'd suggest tackle that end first and the immobilizer end only if you have to.

Apr 18th, 2010, 09:34	#8
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	I expect you're correct, I can only go by my experience. I found the problem was the connector pins on the antenna, I found a hard whitish coloured corrosion on the pins, probably aluminium oxide. This has to be removed to get a good connection at the radio frequency used. I dab of contact grease will help prevent reoccurance.

Apr 19th, 2010, 23:22	#9
Striker01 New Member Last Online: Apr 19th, 2010 23:22 Join Date: Apr 2010 Location: Ontario	I'm gonna look into this on the weekend to see if I can figure it out. I know that I don't see anything glowing around the ignition at night but once again, the car does start and drive perfect (knock on wood)

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