ToyotaModel page
Toyota Highlander diagnostics
High-intent reference: common OBD-II codes seen on the Toyota Highlander. Use a scan tool to confirm the exact code and capture freeze-frame data before repairs.
Common codes
Common code
P0420
Open diagnostics
Common code
P0171
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Common code
P0300
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Common code
P0455
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Common code
P0442
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Common code
P0133
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Common code
P0128
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Common code
P0011
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Common code
P0016
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Common code
P0700
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Common code
P0740
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Common code
P0301
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Common code
P0302
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Common code
P2195
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Common code
P0101
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Common code
P0401
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Common code
P0410
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Common code
P0421
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Common code
P0430
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Common code
P0174
Open diagnostics
Recommended workflow
- Record code(s) + freeze-frame data (RPM, load, trims, coolant temp).
- Address misfires and air/fuel issues before catalyst or O2 codes.
- Confirm with a drive cycle after repair; verify readiness monitors.
Notes
Model pages provide quick navigation and diagnostic context. For the complete checklist and ranked causes, open the exact code page.