Nissan Qashqai P0420 catalytic converter efficiency fault
Engine management light with fault code P0420 catalyst system efficiency below threshold bank 1. The catalytic converter on the 1.2 DIG-T and 1.6 dCi Qashqai has a finite service life of approximately 120,000-150,000 km. Before condemning the catalytic converter, check the lambda sensor upstream and downstream for correct operation — a faulty upstream lambda sensor commonly mimics a failed catalytic converter. Genuine Nissan or OEM-quality replacement catalysts are recommended.
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