The P1130 code in your 2022 Lexus NX indicates a fuel system malfunction where the engine is running too rich or too lean. This Toyota/Lexus-specific code signals the ECU cannot maintain proper air/fuel ratio despite fuel trim corrections.
Understanding Fuel System Faults
The NX's engine computer constantly adjusts fuel delivery to maintain the ideal 14.7:1 air/fuel ratio. P1130 indicates the system is hitting its correction limits, unable to achieve proper combustion mixture.
Common Causes of P1130
- Vacuum leaks affecting airflow
- Faulty air/fuel ratio sensor
- Fuel pressure issues
- Fuel injector problems
- MAF sensor malfunction
- Exhaust leaks before sensor
Symptoms of Rich/Lean Malfunction
- Check engine light on
- Poor fuel economy
- Rough idle
- Hesitation during acceleration
- Black smoke (rich) or backfire (lean)
- Failed emissions test
NX Engine Technology
The 2022 NX uses a turbocharged engine requiring precise fuel control. Rich/lean conditions can affect both performance and the longevity of the catalytic converter.