CEL code 22 - Knock Sensor
#1
CEL code 22 - Knock Sensor
An intermittent CEL light was flickering when I started the car up after I fitted a replacement engine (V8 sti short block and used my P1 heads. The car was off the road for 2 years waiting on the new engine and I originally thought it was the 2 year old fuel I had in the tank that was causing the knock sensor to throw up up a fault so drained the tank and filled it with some fresh momentum and for good measure put in some octane booster.
I reset the ECU and ran the car on idle a few times with no CEL light reappearing. Today I took the car for a short run round the neighbourhood and the light came back on.
I have now removed the sensor and gave it a visual check to see if there was any signs of damage to the casing which there was none and also checked its resistance which measured 4.86Mohm. From research, anything over 4.6Mohm is good.
Fitted the sensor back in and reset the ECU again, checked for codes and there were none, fired it up and the CEL light came on immediately. Checked the codes again and it showed code 22 for the knock sensor.
I'm now wondering if it is the sensor is faulty or if it is detecting knock somewhere. Any thoughts what the issue could be? The MAF sensor is brand new and has just been fitted during the engine swap.
Supposed to be getting the car mapped next week so need to find a solution quick.
I reset the ECU and ran the car on idle a few times with no CEL light reappearing. Today I took the car for a short run round the neighbourhood and the light came back on.
I have now removed the sensor and gave it a visual check to see if there was any signs of damage to the casing which there was none and also checked its resistance which measured 4.86Mohm. From research, anything over 4.6Mohm is good.
Fitted the sensor back in and reset the ECU again, checked for codes and there were none, fired it up and the CEL light came on immediately. Checked the codes again and it showed code 22 for the knock sensor.
I'm now wondering if it is the sensor is faulty or if it is detecting knock somewhere. Any thoughts what the issue could be? The MAF sensor is brand new and has just been fitted during the engine swap.
Supposed to be getting the car mapped next week so need to find a solution quick.
#2
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My knock sensor went faulty but I can't remember if it flashed the light or it stayed on. I did see some cracking on my old sensor though. They aren't expensive so maybe it would be worthwhile replacing it.
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I'd say the sensor is at fault then mate. Just make sure it's plugged in properly and torqued properly I suppose. The cracks can be very small and can let moisture in to the sensor. Is it an old one?
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Maybe disturbing it has caused the issue. It's been through thousands of heat cycles and would be brittle by now I'm sure. When I replaced mine and reset the ecu I had no further problems at all. I think my car went better afterwards!
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