Code result
P0156
O2 Sensor Circuit Malfunction
Moderate severity
What it means
Same condition as P0136 but on the downstream sensor of bank 2. The catalyst efficiency monitor for bank 2 cannot run while this fault is active.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Downstream sensor aged
highOne of the most commonly reported causes for this code — check this first.
Related help
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