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#1
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'07 E320 code-9205 B12/2 refrigerant pressure sensor
I am trying to get my A/C to work on my '07 E320 Bluetec. Before the collision, the A/C worked flawlessly. After replacing the condenser/drier, I had it charged. The compressor would not turn on, and the red light would blink on the A/C switch. I checked for DTC's in the system, and got the 9205 code. "Refrigerant pressure too low. check refrigerant level. B12/2 (refrigerant pressure and temperature sensor)". I had the refrigerant removed, and replaced the switch. I then had it charged again, and the same code came up. I checked the wiring, and it is intact. I also checked the fuses in the front SAM, and they are all good. I also have no idea what fuse is for what, as the only listing is for the fuse panel to the left of the steering wheel, and in the trunk. I am not sure what to do next. If this was a 123, I would have no problem troubleshooting this problem. This chassis is much more complicated than a 123! Any help would be greatly appreciated. Thanks, Rich
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![]() All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#2
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Are you able to see the pressure on the scan tool or pull it up in the AC control like the older ones?
The pressure sensor is probably a 3 wire unit. Power in , ground , signal out. If two wire it will be a variable resistor. Most thread on pressure switches can be changed without discharging the system, there is a valve in the port. From what I recall on the 90's cars, the pressure SW and temp sensor are two units, is this the same on yours? |
#3
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Quote:
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![]() All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#4
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I think it may be a latching fault and you may have to clear codes once you’ve established a proper charge to get the fault to clear. The 210 is like this, although the 210 can clear climate codes from the CCU. Not sure on the 211 since they went to a non-display CCU.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
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