Background
Questions
Question 1 - What are the chances that all 4 Knock Sensors are bad?
Ih8mud, and other Toyota forum research, suggests it highly unlikely that all 4 sensors fail simultaneously, but highly likely that rodent problems and chewed up harnesses could be the problem.
My Tech suggests that if they find its just the harness that is chewed up, they will replace only the harness.
Any feedback on all this?
Question 2 - What other Maintenance should I consider while the Techs are in there doing Knock Sensor/Harness replacement, my GX460 has 90K miles?
Some folks have suggested that “more work should be done, while they are in there, for preventive maintenance and cost savings” e.g. Replace all Knock Sensors, Replace Valve Cover Gaskets, Replace Spark Plugs.
This sounds reasonable, I had the Water Pump and Serpentine Belt replaced last year.
What should be on the list of maintenance done during this project?
Question 3 - Is it OK to drive 200 mile round trip next weekend to an Offroad Club Event with this Error Code, or should I get repairs first? Repairs may not be done before trip.
Many Thanks - Howie
- I’m reaching out for much needed and appreciated suggestions and feedback on what the Techs are suggesting for my GX460 “P0328 Knock Sensor Code” problem.
- My Independent Service Tech, after consulting with the Lexus Dealership, is recommending replacement of all 4 Knock Sensors (2 Left Side, 2 Right Side) to resolve the problem.
- The Lexus Dealer is even suggesting replacement of the EGR Valve, “because the EGR Valves are known to be sensitive, and easily damaged during these repairs, and should be replaced”. My Independent Service Tech disagrees with the idea that the EGR Valve should be replaced, but believes at a minimum both Knock Sensors on the High Bank side should be replaced, if not all 4.
- All thoughts or suggestions would be much appreciated!
Questions
Question 1 - What are the chances that all 4 Knock Sensors are bad?
Ih8mud, and other Toyota forum research, suggests it highly unlikely that all 4 sensors fail simultaneously, but highly likely that rodent problems and chewed up harnesses could be the problem.
My Tech suggests that if they find its just the harness that is chewed up, they will replace only the harness.
Any feedback on all this?
Question 2 - What other Maintenance should I consider while the Techs are in there doing Knock Sensor/Harness replacement, my GX460 has 90K miles?
Some folks have suggested that “more work should be done, while they are in there, for preventive maintenance and cost savings” e.g. Replace all Knock Sensors, Replace Valve Cover Gaskets, Replace Spark Plugs.
This sounds reasonable, I had the Water Pump and Serpentine Belt replaced last year.
What should be on the list of maintenance done during this project?
Question 3 - Is it OK to drive 200 mile round trip next weekend to an Offroad Club Event with this Error Code, or should I get repairs first? Repairs may not be done before trip.
Many Thanks - Howie