P013A

O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 2

Q: Is it safe to drive with P013A?

Yes. It's an emissions-related code that doesn't affect drivability. Fixing it matters for emissions testing and catalytic-converter monitoring, but it isn't urgent.

Q: Can I just clear P013A?

You can, but a slow sensor will set the code again once the monitor runs. Replace the sensor to fix it for good.

Oxygen sensor / fuel metering Generic OBD-II Medium

What it means

P013A means the bank 1, sensor 2 oxygen sensor — the downstream sensor behind the catalytic converter — is switching from rich to lean too slowly. An aging or contaminated sensor reacts sluggishly, which the ECM flags because it can no longer trust the sensor to monitor the converter and help fine-tune fueling. It rarely changes how the car drives.

Medium

Can I keep driving? Yes — this is an emissions-monitoring fault on the downstream oxygen sensor; the car drives normally, but fix it to pass emissions and keep converter monitoring working.

Real-world scan data

Seen in

128

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Usually no noticeable change in driving
Possible slight drop in fuel economy
May fail an emissions test

Common causes

Most likely first

Aged or contaminated downstream oxygen sensor (bank 1, sensor 2) — the most likely causeLikely
Exhaust leak near the sensor drawing in outside airCommon
Corroded connector or damaged wiring at the sensorCommon
Poor fuel quality or incorrect fuel pressure affecting the mixtureLess often
Rarely, an ECM faultLess often

How to diagnose & fix

Work through it in order

Read live data and watch the downstream sensor's response speed against a known-good pattern.
Inspect the exhaust for leaks upstream of the sensor.
Check the sensor connector and wiring for corrosion or damage.
Replace the bank 1, sensor 2 oxygen sensor if it responds slowly.
Clear the code and re-run the readiness monitor to confirm the fix.

FAQ

Quick answers

Is it safe to drive with P013A?+

Yes. It's an emissions-related code that doesn't affect drivability. Fixing it matters for emissions testing and catalytic-converter monitoring, but it isn't urgent.

Can I just clear P013A?+

You can, but a slow sensor will set the code again once the monitor runs. Replace the sensor to fix it for good.

Read & clear P013A yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX