P0420 on a Nissan Rogue
P0420 means catalyst System Efficiency Below Threshold (Bank 1). On the Rogue, a few causes come up far more than others.
What P0420 usually means on a Rogue
P0420 on the Rogue means bank 1's catalytic converter is reading below its efficiency threshold. On QR25 Rogues the close-coupled converter ages and loses efficiency, and on high-mileage cars substrate breakdown is worth checking. A slow rear O2 sensor commonly imitates a bad cat. It will not hurt driveability but will fail emissions and should not be ignored on a worn engine.
Most common causes on the Rogue
- Aged catalytic converter
The QR25's converter loses efficiency with age and heat.
- Lazy downstream O2 sensor
A slow rear sensor mimics a failed cat at a fraction of the cost.
- Upstream misfire glazing the cat
Coil-driven misfires on the QR25 overheat the converter.
- Exhaust leak before the rear sensor
A leak skews the efficiency reading.
What P0420 costs to fix on a Rogue
Confirm the rear O2 sensor with live data before condemning the converter - it is much cheaper. A quality converter for the Rogue is a several-hundred-dollar part with moderate access. If the engine has misfired heavily, fix that first so the new cat is not damaged.
Year, engine and mileage change the answer. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Nissan Rogue
Related symptoms
Nissan Rogue problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0420 behavior is covered on the main P0420 page. Confirm with a scan tool before buying parts.
P0420 on your Rogue?
Every problem becomes a Case. Tell Redline what your Rogue is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.