LE
Japan Manufacturer
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Powertrain Engineering Analysis
Lexus OBD2 Diagnostic Portal
Lexus luxury platforms combine Toyota reliability with refined electronic sensors. Frequent diagnostic codes involve A/F ratio sensor heater failures, variable valve timing gear rattling on V6 engines, and secondary air injection pump valve sticking on V8 models (GX460).
Primary Engine Families Cataloged
3.5L V6 2GR-FE / 2GR-FKS
2.5L 4-Cyl A25A
4.6L V8 1UR-FE
Commonly Diagnosed Vehicle Models
Lexus RX 350
Lexus ES 350
Lexus IS 250 / IS 350
Lexus NX 300
Lexus GX 460
Lexus Factory Service Advisories & Field Notes
P2237 / P0135 Upstream Air/Fuel Sensor
Lexus 3.5L 2GR-FE V6 engines (RX350/ES350) use Denso wideband A/F sensors. The rear Bank 1 Sensor 1 is tucked tightly against the firewall. Using a specialized flex-head 22mm oxygen sensor wrench makes replacement a 20-minute job.
High-Frequency Lexus Trouble Codes
Click any diagnostic trouble code to view in-depth multimeter specs, factory TSBs, and repair workflows:
P0420
Moderate
Catalyst System Efficiency Below Threshold (Bank 1)
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P0430
Moderate
Catalyst System Efficiency Below Threshold (Bank 2)
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P0171
High
System Too Lean (Bank 1)
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P0128
Low to Moderate
Coolant Thermostat (Coolant Temp Below Regulating Temp)
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P0011
High
Camshaft Position 'A' Timing Over-Advanced (Bank 1)
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P0300
Critical
Random or Multiple Cylinder Misfire Detected
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