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2000 rx300 Knock sensor

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Hey guys. I’m new to the forum, but I’ve been through as many threads as I can about this issue. Here’s my dilemma. I did the wire hack which worked for about six months. Now my codes are for both of the sensors being bad. I mounted a sensor on the engine support bracket. I tied in the new harness, but I’m still getting the code. I have ground at the sensor, continuity from the ECU wire all the way out to the sensor, I just have no clue what sort of reading I’m supposed to be getting. Also, where am I supposed to be getting the reading from, the sensor or ecu? I just purchased a new Denzo knock sensor because the ones I bought are new but they’re dorman brand. I figure I’d get an oem sensor to see if that fixes the issue but any help between now and when the sensors come in would be a helpful. 

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Here are a few insights that might help:

  1. Knock Sensor Readings: The knock sensor detects vibrations that come into the sensor body to determine if there is knocking. These sensors send a signal to the ECU (Engine Control Unit) to !Removed! the ignition timing if knocking is detected. As for where to get the reading from, it’s typically done at the ECU, as the sensor sends its signal there.

  2. Sensor Brands: Regarding the Denso vs. Dorman debate, it’s generally recommended to use OEM (Original Equipment Manufacturer) parts when possible. Denso is an OEM supplier for many Toyota (and by extension, Lexus) parts, and is often recommended for its reliability. Some users have reported issues with aftermarket brands like Dorman.

  3. Sensor Issues: If you’re still getting a code after replacing the sensors and the wiring harness, it could be due to a few reasons. It could be a problem with the ECU, a loose knock sensor, or a fault in the wiring harness. Also, ensure that the sensors are properly grounded as this can cause issues.

  4. Resetting the ECU: After replacing the sensors and the harness, it’s important to reset the ECU. This can be done by disconnecting the battery for a few minutes then reconnecting it. This allows the ECU to start fresh and recognize the new sensors.

Remember, while these tips are based on general advice and experiences from other Lexus owners, it’s always best to consult with a professional mechanic or a Lexus specialist for your specific situation. Good luck, and I hope the new Denso sensors resolve the issue!


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