1.9TDi BKC - Coolant Temp Sensor (P2185 Error Showing)

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Afternoon All. How many coolant temperature sensors are there on a standard 2004 (54) 1.9TDi BKC engine? I have so far changed the Thermostat and the coolant temp sensor that's down near the clutch slave. Are there any more? If so can someone point me to an exact location or diagram (I did buy a spare sensor just in case). Still getting a "P2185 - Engine Coolant Temperature Sensor 2 Circuit High Passive" error message on my ODB11 (showing as Green/Intermittent). Thoughts and ideas please guys. TIA. #1 · Jul 25, 2019 Afternoon All. How many coolant temperature sensors are there on a standard 2004 (54) 1.9TDi BKC engine? I have so far changed the Thermostat and the coolant temp sensor that's down near the clutch slave. Are there any more? If so can someone point me to an exact location or diagram (I did buy a spare sensor just in case). Still getting a "P2185 - Engine Coolant Temperature Sensor 2 Circuit High Passive" error message on my ODB11 (showing as Green/Intermittent). Thoughts and ideas please guys. TIA. Sort by Oldest first Oldest first Newest first Most reactions #2 · Jul 26, 2019 On most there's usually one up around the head somewhere, that's where I'd look if Google failed me #3 · Jul 26, 2019 Thanks, Seatman. Yep, that's the one I replaced. On the assumption that the early MK5 TDi engines only had one Coolant Sensor, I might stick the other spare sensor I have in just in case the current "new" sensor is faulty. #4 · Jul 26, 2019 (Edited) VAG Error Code: 008581/16837/10938/4238 EOBD II Error Code: P2185 Fault Location: Engine Coolant Temperature Sensor on Radiator Outlet (G83) - Circuit High/Short Circuit to Positive/Signal too High/Lower Limit Exceeded Possible Cause: Malfunction Indicator Lamp (MIL)(K83) active. Wiring/Connector(s) short to positive. Engine Coolant Temperature Sensor on Radiator Outlet (G83). Possible Solutions: Check/Replace all faulty Wiring/Connector(s). Read Measuring Value Blocks (MVB). e.g. VAG Error Code: 00522 Fault Location: Engine Coolant Temperature Sensor (G62) - Open Circuit/Short Circuit to Positive Possible Cause: Difficulties with starting a cold engine. Starting the engine when engine is warmish or warm, idle rpm immediately is 1200 - 3000 rpm. RPM at idle is irregular. With all engine temperatures seldom idle rpm will vary between 900 - 1000 rpm. With engine warm (90 °C) the engine temperature suddenly drops (70 °C) and slowly comes back to 90 °C. Bad acceleration during warming up. Diesel: an indication is extreme long time burning time of the glow indication light. Wiring/Connector(s). Moisture in wiring harness of Engine Coolant Temperature Sensor (G62). Engine Coolant Temperature Sensor (G62) faulty. Possible Solutions: Check/Replace all faulty Wiring/Connector(s). Check/Replace Engine Coolant Temperature Sensor (G62). Special Notes: In MY 1995-2002 (?) in Europe at VW-cars the G2/G62 had the bad reputation of breaking down often. The default G2/G62 is black and all replacements are green. As taken from my new Free EOBD II Error Codes software #5 · Jul 26, 2019 That's great, thanks Keith. From your experience, is the sensor above or below the radiator, and drivers (UK) side or passenger side? The replacement sensors I have are green so they will be the updated ones. #6 · Jul 27, 2019 OK. So to answer my own question the location of the secondary coolant sensor on a MK5 Golf 1.9TDi with the BKC engine <- a description so that Google can pick it up should anyone else need the info. On a RHD it's located on the hose of the nearside (Passenger Side) radiator in front of the fans. There's not much space for big hands to work so you may find it easier to move a couple of hoses and electrical connectors to get better access. Picture below. Tools needed : Small flat head screwdriver - to remove electrical connector and the rear horseshoe clip. Pipe Grips or Long Nose Pliers - to remove the hose clip if you are having trouble with access. I then threw mine away and replaced it with a Jubilee Clip as they are much easier to work with. Replacement coolant (or water for a short term test to make sure the problem is solved). I did a complete fluid flush as it was obvious that mine has never been changed. Method. Take off the electrical connector on top of the sensor. With a small flathead screwdriver pull the horseshoe locating clip out from the back of the sensor. Turn and pull sensor anti-clockwise 90 degrees and pull it out. Remove old rubber o-ring and clean the area where the new sensor goes. Put in new rubber 0-ring Put in sensor, push and turn clockwise 90 degrees. Put in new horseshoe clip and pull the sensor gently to ensure it doesn't come out. Put the electrical connector back on. Replace and other hoses you may have moved. Then. Check the coolant reservoir and top up as necessary. Start the car (with the bonnet/hood up. Get a cup of tea, Yorkshire Tea is best. PG if desperate. Leave the car to idle for 5 minutes so the coolant flows and starts to get to temperature. Get a willing assistant to then keep the car revved at 2.5 - 3k revs to help bleed the coolant system. Keep an eye for bubbles coming through the coolant reservoir. Bubbles are a sign that the air is being bled. Keep an eye on the cars temp. You should be at least halfway to 90 degrees by now. Go for a 10-minute drive. You may get a coolant temp error. Don't panic. When you get home top up as necessary and bleed some more. When coolant level is stable, there are no bubbles and the temperature gauge is looking normal (90) then you are all set. Hope this helps someone.

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