Is It Safe to Drive With a P0157 Code?
Common Symptoms of a P0157 Fault
P0157 Symptoms at a Glance
EML on
May contribute to P0430
No significant driveability issues
Possible Causes of P0157
A P0157 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
Common Causes of P0157
O2 Sensor Wiring Short — B2 S2
Downstream bank 2 sensor wiring shorted to ground.
O2 Sensor Failure
Bank 2 downstream sensor stuck reporting lean.
Exhaust Leak
Air ingress after bank 2 catalyst.
Catalyst Issue
Failing bank 2 catalyst causing abnormal readings.
Why we don't list the exact part: A P0157 code tells you what's happening but not why. Replacing parts without diagnosis is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0157 and Your MOT
A stored P0157 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure. Get the fault diagnosed and repaired, then have the code cleared before booking your test.