P0153: O2 Sensor Circuit Slow Response (Bank 2, Sensor 1)
Updated November 15, 2026
The same check as P0133, but for the upstream oxygen sensor on bank 2, the side of a V6 or V8 engine that doesn't have cylinder 1. The sensor is reacting too slowly to changes in the exhaust, usually because it's getting old. Traditional switching (narrowband) sensors should flip quickly between rich and lean; many newer vehicles use an air-fuel ratio (wideband) sensor upstream that gives a steady reading instead, so check which type you have before judging it by switching.
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🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?
Common causes
- An aging or contaminated bank 2 upstream O2 or air-fuel ratio sensor
- An exhaust leak near the sensor, such as a leaking exhaust manifold gasket
- Wiring or connector problems at the sensor
- Engine issues such as oil burning or a coolant leak that foul the sensor
Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.
Symptoms
- Check engine light
- Lower fuel economy
- Sometimes rough idle or hesitation
Is it safe to drive?
Usually drivable with a steady light, but a lazy sensor can hurt fuel economy and eventually the catalytic converter. If the light flashes, stop driving and get it checked.
How to check it with a scanner
- Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
- Confirm which side is bank 2 for your engine and which sensor type it uses.
- For a narrowband sensor, watch it in live data at about 2,500 RPM; it should switch back and forth rapidly. Compare it with the bank 1 upstream sensor. Keep hands clear of the belts and fan.
- A wideband air-fuel ratio sensor won't switch like that; judge it with a scanner that shows its readings in current or air-fuel ratio, or have a shop test it.
- With the engine cool, check for exhaust leaks ahead of the sensor and inspect its wiring for heat damage.
- After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.
A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.
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Questions
What does P0153 mean?
P0153 is the generic OBD2 code for "O2 Sensor Circuit Slow Response (Bank 2, Sensor 1)." The same check as P0133, but for the upstream oxygen sensor on bank 2, the side of a V6 or V8 engine that doesn't have cylinder 1. The sensor is reacting too slowly to changes in the exhaust, usually because it's getting old. Traditional switching (narrowband) sensors should flip quickly between rich and lean; many newer vehicles use an air-fuel ratio (wideband) sensor upstream that gives a steady reading instead, so check which type you have before judging it by switching.
Is it safe to drive with P0153?
Usually drivable with a steady light, but a lazy sensor can hurt fuel economy and eventually the catalytic converter. If the light flashes, stop driving and get it checked.
How do I check P0153 myself?
Read the code and freeze-frame data with an OBD2 scanner, then: Confirm which side is bank 2 for your engine and which sensor type it uses. For a narrowband sensor, watch it in live data at about 2,500 RPM; it should switch back and forth rapidly. Compare it with the bank 1 upstream sensor. Keep hands clear of the belts and fan. A wideband air-fuel ratio sensor won't switch like that; judge it with a scanner that shows its readings in current or air-fuel ratio, or have a shop test it. With the engine cool, check for exhaust leaks ahead of the sensor and inspect its wiring for heat damage.
Related codes
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