BMW
Post-cat fuel trim too lean, bank 1. The rear oxygen sensor sees lean exhaust after the cat.
P2096 fault code: what it means
P2096: Rear O2 sensor shows bank 1 is still lean after the cat, so the engine computer has hit its correction limit.
Usual causes, most likely first
- small exhaust leak before the rear O2 sensor
- aged rear O2 sensor
- intake air leak
P2096 by make
Hyundai
Post-catalyst fuel trim too lean.
Jeep
Post-catalyst fuel trim too lean, bank 1.
Kia
Post-catalyst fuel trim too lean.
Mazda
Mazda: rear O2 sensor fuel control says mixture too lean on SkyActiv-G. Often an exhaust leak or tired sensor.
Mini
Post-cat fuel trim too lean. Rear oxygen sensor sees lean exhaust after the cat.
Subaru
Rear O2 sensor sees a lean mixture after the cat. On Subaru the front A/F sensor or an exhaust leak is more likely than the rear sensor.
What the repair usually costs
- Air-fuel ratio / front O2 sensor replace (upstream)NZ$270–NZ$750 · A$260–A$730
- O2 sensor replace (downstream / after cat)NZ$180–NZ$480 · A$180–A$460
- Catalytic converter replace, aftermarket direct-fitNZ$570–NZ$1,570 · A$540–A$1,490
- Catalytic converter replace, genuineNZ$1,640–NZ$5,160 · A$1,470–A$4,590
Not sure what P2096 means on your car? Ask Credov.
Before you clear it
Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.
Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.