Error code P1664

[P3z]

Please does anyone know what this error code is related to.
Many Thanks

 

[Alex Crow]

That relates to a heater booster fault, a common problem.

 

[P3z]

Thanks

 

[P3z]

That relates to a heater bosster fault, a common problem.

Would that prevent the car from starting?

 

[Alex Crow]

Would that prevent the car from starting?

I thought that might be the next question - no, it will have no effect.


So you have a starting problem...

Every start, or just when it has been standing for a while (eg overnight)?
Does facing up or down a slope make any difference?
Does it initially fire up for a split second, then require lots of cranking?

 

[WG M-B]

It would only prevent the car from starting once it had drained the life out of the battery!

 

[P3z]

I thought that might be the next question - no, it will have no effect.


So you have a starting problem...

Every start, or just when it has been standing for a while (eg overnight)?
Does facing up or down a slope make any difference?
Does it initially fire up for a split second, then require lots of cranking?

Usually when it has been standing overnight, it fires for a split second then dies...

 

[Alex Crow]

Usually when it has been standing overnight, it fires for a split second then dies...

Then most likely you have tired o-rings, which will need replacing.
The crucial ones are on the low and high pressure pumps on the front of the engine, part number A601 997 06 45

 

[mutleyomels]

Car is a 2005 C270 showing fault code P1664.Problem is when i Kick down,so much black smoke the road cannot be seen,on normal pull away it also smokes,then as the car picks up, it will clear. no problem with starting,although it has a Glow plug out,that i will fix this week.All filters have been re`placed.Any help i would be most grateful.

 

[Craiglxviii]

Car is a 2005 C270 showing fault code P1664.Problem is when i Kick down,so much black smoke the road cannot be seen,on normal pull away it also smokes,then as the car picks up, it will clear. Any help i would be most grateful.

I just replied on your other thread.

P1664 Electric heater booster equipment fault
P1664 electric heater fault
P1664 electric heater open
P1664 electric heater output stage fault
P1664 electric heater short
P1664 heater
P1664 load signal of electric heater motor implausible

You already have the answer above if you read the posts.

 

[mutleyomels]

Thanks Craig.Diagnostic with latest Snap On showed this code P1664,then the Glow Plug fault as P1481,but that is not the cause of the smoke problem, Heater Motor,will be fixed that's not a problem,it now seem a case of chase one thing after another until fault is found.

 

[Craiglxviii]

Yes, using Snap On diagnostic with MB is problematic as what they show the code to be, vs what it actually is can be two different things. A number of members here have had the exact same problem, for this reason I bought myself an iCarsoft i980, others have the MBII and both have worked well (purpose-designed for MB cars).

 

[mutleyomels]

Big thanks Craig.That solves the problem,as i knew it was not heater related,i guess i will take your advice and get it checked with the diagnostic you recommend.Thanks again Pat

 

[mutleyomels]

Yes, using Snap On diagnostic with MB is problematic as what they show the code to be, vs what it actually is can be two different things. A number of members here have had the exact same problem, for this reason I bought myself an iCarsoft i980, others have the MBII and both have worked well (purpose-designed for MB cars).

Craig As you pointed out SNAP ON will sometimes give wrong reading,in this case it did,the Boster Heater works perfect,(Sorry for late reply,work problems)
Now going for the Air Mass as sometimes the engine surges,but Mercedes Diagnostic first,(must remember to ask for a print out). Pat

 

[Craiglxviii]

No probs, hope you get it all sorted!

 

[CoreBucky]

did u every get this problem sorted as a have same fault code including it saying none of the glowplugs work and P1189 as well.