Question about 2001 Toyota Highlander

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Engine code 430 for 2001 toyota highlander - 2001 Toyota Highlander

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Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter

Diagnostic Help:
To diagnose a P0430 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilloscope to check the waveforms of both upstream and downstream O2 sensors. The rear reading should vary, the front should be steady. Replace as necessary. Check the rear Heated O2 Sensor. Check the catalytic converter, replace if necessary. If necessary, check for wiring and component. hopes this helps thanks

Posted on May 30, 2010

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Posted on Jan 02, 2017

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Welcome to FixYa. I'll be glad to help you out.

Code P-1150 indicates an Air-Fuel sensor range/performance issue.

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Without in-depth analysis on a scan tool that can read the output of the A/F sensor, it is hard to tell you exactly what is happening, but prior experience indicates that you probably need to replace the A/F sensor.

You would do well to purchase a genuine Toyota A/F sensor, as the cheaper 'aftermarket' units do not perform well; your check engine light may remain on after you replace the sensor with an aftermarket

Thanks for choosing FixYa for advice.

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