Mongoose M25



A customer made a comment to me last week about how my blog had changed the way they look at car alarms. He had a Mongoose M60GNZ and was feeling a little paranoid after reading the “can your remote be copied?” post.

Although he trusted my view points and opinion he was still trying to get his head around the idea that an “Insurance approved” car security system could have such a basic flaw,  so he asked me to demonstrate how easy it actually was to make a copy of his remote.

I took his car keys, and spent 15 seconds programing a new remote that I had (Note: I’m not posting the actual method here for obvious reasons) and then said “done!”

His jaw dropped in horror and the reply then came. “I’d like a quote on a new alarm system please“.

Mongoose M25 Transponder Immobiliser

You’re probably thinking what the hell has this got to do with the Mongoose M25 Immobiliser? Well that’s simple, it suffers from the same flaw! Unlike the Autowatch 573PPi or the Dynatron D2200 which both require the over-ride pin code to program a new transponder tag,  the Mongoose M25 can have a new transponder tag coded to the system in a matter of seconds. This in my view is a major oversight!

Certified to AS/NZS4601 amendment 1 2003 Immobiliser Standard

Yes it meets with the above standard (Mongoose has their own self appointed rating system and call it a “3 star”) but what security does that really offer? Let’s be honest here, AS/NZS4601 is a not even worth the paper it is printed on, if you passed me a copy of it I would probably end up using it as toilet paper! My advice for what it is worth is to look for a Thatcham CAT 2 approved Immobiliser system.

On a positive note at least the M25 does not unlock your doors so a scumbag with a copied transponder tag would have to go to the trouble of actually breaking into the car! The M25 also has the lowest RRP of the three Transponder systems available.

The M25 comes with three immobiliser cuts where as both the Autowatch 573PPi and Dynatron D2200 only have two, having said that the Mongoose is the largest unit of the 3 which makes it harder for a good installer to hind. It is also easy to open up.

M25 Transponder Immobiliser

Mongoose Immobiliser M25

RRP NZ: $299.00

Mongoose Rating: 3 Star

Obsessive Rating: EPIC FAIL!

You may as well have a sticker on your car window saying “Take Me!”

The M25 is to bulky, and despite being the cheapest falls along way short of what I would expect from a vehicle security system.



  • Three Circuit Immobiliser
  • X2 Transponder Tags

PDF iconM25 User Manual

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5 Responses to Mongoose M25

  1. Rick says:

    This is a great review and a quintessential example of how a security device should not be taken at face value. When you’re designing a security system you’re supposed to imagine ways it could be defeated and ensure that such a scheme is either ineffective or requires more effort than the result is worth. This should be in a category called “comedy immobilizers”. LOL for the Obsessive Rating!

  2. Julian says:

    Anyone would think that the current standard are set up to allow people to sell old products that the rest of the world won’t approve! Or am I just being a cynic here?

    I shall be raising some more questions about the existing standards soon. Apparently I am going to be invited to the next NZSA vehicle security committee meeting, if it ever happens! I’ve been a member for two years now and to the best of my knowledge they haven’t even had an AGM!!!

    In the mean time I shall be writing a list of recommendations.

  3. Rick says:

    I will say this much from the consumer end of this problem; any kind of “rating” for a security device (like the star system) had better be somehow indicative of how secure it actually is and, say, proportional to the effort and/or time it would take to defeat it (if installed according to some related standard). To me “5 star” should mean damn near inpenetrable and yet a 5-star alarm in NZ does not necessarily offer any such thing.

    I’m behind any effort to fix this misleading nonsense.

  4. Julian says:

    Hi Rick,

    Thanks for the support. I’ll start off with an email to Greg Watts, the Executive Officer at the NZSA:

  5. Pingback: Transponder Immobilisers | Obsessive Vehicle Security Blog

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