Making the Tire Pressure Warning Lamp go out
01-04-2010, 01:58 PM
#1
Super Member
Thread Starter
Making the Tire Pressure Warning Lamp go out
My car had been sitting outside for almost 2 weeks and when I started driving after a couple of miles the dash display went red and it indicated that I needed to stop urgently as one of the pressures (The display mentioned 'RL' - I assume rear left) was low. Unsurprising given the cold temperatures...The dash display also showed there was '1 Malfunction'.
I stopped at the nearest gas station and filled it up as per the instructions inside the driver's door (35psi for cold). The rear left was at 31 so topped it up to 35, and checked the other side which was already at 35 so left it as is.
The display mentioned about resetting the TPMS once the pressures were corrected. I pressed 'R' to get rid of it and then drove home. The tire pressure lamp didn't go out and on the way to work this morning it still showed up.
I took a quick look through the manual when at the gas station last night but I'd been up for 20hrs and needed to drive 2hrs home so didn't spend too long looking at it...
Any guidance would be great!
Thanks!
I stopped at the nearest gas station and filled it up as per the instructions inside the driver's door (35psi for cold). The rear left was at 31 so topped it up to 35, and checked the other side which was already at 35 so left it as is.
The display mentioned about resetting the TPMS once the pressures were corrected. I pressed 'R' to get rid of it and then drove home. The tire pressure lamp didn't go out and on the way to work this morning it still showed up.
I took a quick look through the manual when at the gas station last night but I'd been up for 20hrs and needed to drive 2hrs home so didn't spend too long looking at it...
Any guidance would be great!
Thanks!
01-04-2010, 10:33 PM
#2
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2005 S500 4-Matic, 1978 450SL
The reset procedure IS in the owners manual.
See post #6 at https://mbworld.org/forums/s-class-w...ml#post2749528 for info on what might keep it from resetting.
See post #6 at https://mbworld.org/forums/s-class-w...ml#post2749528 for info on what might keep it from resetting.
Last edited by Skylaw; 01-05-2010 at 08:05 AM.
01-05-2010, 09:40 AM
#3
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96 and 08 911 turbos
My car had been sitting outside for almost 2 weeks and when I started driving after a couple of miles the dash display went red and it indicated that I needed to stop urgently as one of the pressures (The display mentioned 'RL' - I assume rear left) was low. Unsurprising given the cold temperatures...The dash display also showed there was '1 Malfunction'.
I stopped at the nearest gas station and filled it up as per the instructions inside the driver's door (35psi for cold). The rear left was at 31 so topped it up to 35, and checked the other side which was already at 35 so left it as is.
The display mentioned about resetting the TPMS once the pressures were corrected. I pressed 'R' to get rid of it and then drove home. The tire pressure lamp didn't go out and on the way to work this morning it still showed up.
I took a quick look through the manual when at the gas station last night but I'd been up for 20hrs and needed to drive 2hrs home so didn't spend too long looking at it...
Any guidance would be great!
Thanks!
I stopped at the nearest gas station and filled it up as per the instructions inside the driver's door (35psi for cold). The rear left was at 31 so topped it up to 35, and checked the other side which was already at 35 so left it as is.
The display mentioned about resetting the TPMS once the pressures were corrected. I pressed 'R' to get rid of it and then drove home. The tire pressure lamp didn't go out and on the way to work this morning it still showed up.
I took a quick look through the manual when at the gas station last night but I'd been up for 20hrs and needed to drive 2hrs home so didn't spend too long looking at it...
Any guidance would be great!
Thanks!
01-05-2010, 07:23 PM
#4
Super Member
Thread Starter
Oh dear, schoolboy error 
Thanks for the heads up though...
Tonight I reset the TPMS and drove for long enough to get the pressures back reading again. Strangely the dash gave me the 'warning tire defect' issue (in red) citing the pressure despite the fact pressures on the display were almost exactly what the cold pressure listed inside the driver's door! May have been 35/36 on the rear and 32 on each side on the front.
Thanks for the heads up though...Tonight I reset the TPMS and drove for long enough to get the pressures back reading again. Strangely the dash gave me the 'warning tire defect' issue (in red) citing the pressure despite the fact pressures on the display were almost exactly what the cold pressure listed inside the driver's door! May have been 35/36 on the rear and 32 on each side on the front.
01-05-2010, 09:16 PM
#5
Oh dear, schoolboy error Thanks for the heads up though...
Tonight I reset the TPMS and drove for long enough to get the pressures back reading again. Strangely the dash gave me the 'warning tire defect' issue (in red) citing the pressure despite the fact pressures on the display were almost exactly what the cold pressure listed inside the driver's door! May have been 35/36 on the rear and 32 on each side on the front.
Thanks for the heads up though...Tonight I reset the TPMS and drove for long enough to get the pressures back reading again. Strangely the dash gave me the 'warning tire defect' issue (in red) citing the pressure despite the fact pressures on the display were almost exactly what the cold pressure listed inside the driver's door! May have been 35/36 on the rear and 32 on each side on the front.
01-05-2010, 10:11 PM
#6
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96 and 08 911 turbos
Oh dear, schoolboy error Thanks for the heads up though...
Tonight I reset the TPMS and drove for long enough to get the pressures back reading again. Strangely the dash gave me the 'warning tire defect' issue (in red) citing the pressure despite the fact pressures on the display were almost exactly what the cold pressure listed inside the driver's door! May have been 35/36 on the rear and 32 on each side on the front.
Thanks for the heads up though...Tonight I reset the TPMS and drove for long enough to get the pressures back reading again. Strangely the dash gave me the 'warning tire defect' issue (in red) citing the pressure despite the fact pressures on the display were almost exactly what the cold pressure listed inside the driver's door! May have been 35/36 on the rear and 32 on each side on the front.
The TPMS on my car literally gave me and my dealer fits until they replaced the control unit. I used to get the warnings all the time. Since the new control unit, it has been 100% perfect.
01-06-2010, 09:46 AM
#7
Super Member
Thread Starter
The car gave me rather different readings on the way to work than it did last night (in Skylaw's thread it mentioned that it shows default on the dash display after reset) so I'm going to have a play with some air tonight and get them in check somewhat, then try resetting again. Fun times!
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01-06-2010, 10:44 AM
#8
MBWorld Fanatic!
Just for reference guys:
I run my tires 34 up front and 26 in the rear for better bite
On RARE occasions, I get the idiot reading. Hit reset and its gone. I agree with the above post that you probably have a low battery in one of the sensors. By the way, they are NOT replaceable and they are NOT cheap, go figure.
Or at least that what my MB tech says.
Good luck
I run my tires 34 up front and 26 in the rear for better bite
On RARE occasions, I get the idiot reading. Hit reset and its gone. I agree with the above post that you probably have a low battery in one of the sensors. By the way, they are NOT replaceable and they are NOT cheap, go figure.
Or at least that what my MB tech says.
Good luck
01-06-2010, 01:21 PM
#9
Super Member
Thread Starter
Just for reference guys:
I run my tires 34 up front and 26 in the rear for better bite
On RARE occasions, I get the idiot reading. Hit reset and its gone. I agree with the above post that you probably have a low battery in one of the sensors. By the way, they are NOT replaceable and they are NOT cheap, go figure.
Or at least that what my MB tech says.
Good luck
I run my tires 34 up front and 26 in the rear for better bite
On RARE occasions, I get the idiot reading. Hit reset and its gone. I agree with the above post that you probably have a low battery in one of the sensors. By the way, they are NOT replaceable and they are NOT cheap, go figure.
Or at least that what my MB tech says.
Good luck
How much is not cheap? Not cheap for the part, or not cheap as far as W220 repairs go?
01-06-2010, 01:32 PM
#10
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96 and 08 911 turbos
At the dealer, sensors are like almost $300 each. You can get a whole set from tire rack for $300 that will work but are not MB branded, or you can get them for $90 each in an MB box from www.parts.com.
The control unit is like $850 or so.
The control unit is like $850 or so.
01-06-2010, 07:59 PM
#11
Super Member
Thread Starter
Had a play with some air and reset the TPMS and once it had figured itself out (ca. 10mins or so) it decided it was happy. For the first time after this reset the 'Tire Defect' warning didn't appear. Fingers crossed it is sorted, time will tell!
Update:
On the way into work this morning all was fine until after about 5 mins when the "Tire Pressure, RL Caution Tire Defect" light came back on again. Sounds like, as you've suggested, the rear left TPMS sensor is gone. Looks like they're $69 a pop on parts.com. Not bad.
Update:
On the way into work this morning all was fine until after about 5 mins when the "Tire Pressure, RL Caution Tire Defect" light came back on again. Sounds like, as you've suggested, the rear left TPMS sensor is gone. Looks like they're $69 a pop on parts.com. Not bad.
Last edited by Fraser; 01-07-2010 at 08:46 AM.
