I'm having issues with a knock sensor code, P0237 on bank 1. Before I tear apart the top of the engine to replace it, I'd like to test the resistance. I can take a reading from bank 2 but would like a third reading from somebody else to also compare if somebody could help me out with that. I don't know if the V12 and V8 knock sensors would have the same reading.
Some years ago on my wife's Nissan, I was getting a persistent knock sensor code. The sensor was known to be in a spot you nearly had to yank the engine to get at it. The temporary solution (that was about 10 years lol) was to simply unplug it and put in a resistor so the computer would think the knock sensor was there and fully functioning. I might try that again. As a "temporary" solution of course...
Edit: so I just went to take a reading from bank 2 but can't seem to get one. No matter what range i set it to, it stays at 1. Maybe because it's installed in the car and grounded?
Last edited by RIboater2; 07-22-2018 at 07:21 PM.
More common for the wiring to get damaged than the sensors themselves to fail.
Perhaps the open circuit you're seeing is a result of that.
I'm not sure what type of reading you are taking but mine was crusty wire insulation at the plug.
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The knock sensors are piezo (ceramic) transducers - and you do not get a resistance reading from them - and unfortunately using a resistor won't fool the ECU either!
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
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If I'm not mistaken the sensor would generate a voltage when vibrating at the correct frequency. I think I've heard of people tapping on the sensor and getting a voltage reading. Probably a job for a scope much like the cam and crank sensors. You would still have to pull the intake. The next time I pull my intake I will change mine. Until then I can live with the CEL light on.
01' 750il Chromeline
95 M3 LS swapped
07 M5 Manual
06' M5, Spartan wheels and a 507hp V10
00' 740il Dinan, CAI, Romulus exhaust, Stage 5 engine and transmission tune, 750 brakes, camber plates, strut tower brace. Sold
00' 323i wagon for daughter
03' 525i wagon for the wife, sold
98' 740i for the daughter, wrecked
92' 525i with over 200k, wrecked
02' R1200 CLC, hit by a bus and broken in half. That one made the news!
It's like herpes there is no cure but if treated properly you can live with it for the rest of your life
By the point you remove all the parts to actually tap on the sensor you might as well change it!
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
If a resistor worked to fool the ecu of a Nissan, why wouldn't it work for a BMW? I'm thinking a .5V 1 Ohm would do the trick.
You can't fool a BMW. The car even knows when you don't spend $400 on a MAF from BMW
01' 750il Chromeline
95 M3 LS swapped
07 M5 Manual
06' M5, Spartan wheels and a 507hp V10
00' 740il Dinan, CAI, Romulus exhaust, Stage 5 engine and transmission tune, 750 brakes, camber plates, strut tower brace. Sold
00' 323i wagon for daughter
03' 525i wagon for the wife, sold
98' 740i for the daughter, wrecked
92' 525i with over 200k, wrecked
02' R1200 CLC, hit by a bus and broken in half. That one made the news!
It's like herpes there is no cure but if treated properly you can live with it for the rest of your life
continuing along.... to be sure replacing the sensors would work, what would happen if I just plugged in a new sensor without actually bolting it to the engine block? The code I'm getting is for low signal which would seem to be a wiring issue. I"m not actually getting a knock code. I'm thinking being bolted into the block also grounds it and may be necessary to complete the circuit. But maybe not?.....
It is completely encapsulated and doesn't ground out when bolted down. I would expect an error code if not bolted down - but who knows!
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
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