P2572 — Direct Ozone Reduction Catalyst Deterioration Sensor Circuit
P2572 — Direct Ozone Reduction Catalyst Deterioration Sensor Circuit. A fault in the catalytic converter efficiency monitoring. The car is usually drivable while you plan the repair. Typical causes: exhaust leak ahead of the converter, faulty downstream or upstream oxygen sensor, engine misfires damaging the catalyst.
powertrain (engine/transmission)
Is it safe to drive?
Short-term driving is OK Usually safe to drive for a limited time: the car remains drivable, but emissions are elevated and fuel economy suffers. Do not postpone if you notice power loss, overheating of the exhaust, or a strong smell — a clogged converter can damage the engine.
How to diagnose with an OBD scanner
- Read the code and freeze frame Connect an OBD2 scanner, confirm P2572 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the catalytic converter efficiency monitoring for damage, corrosion, chafing or poor contact.
- Subsystem check Compare upstream and downstream O2 sensor waveforms in live data — a healthy converter smooths the rear signal.
- Subsystem check Check for exhaust leaks and rule out misfire codes before condemning the converter.
- Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2572 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2572 (parts and labor, USD, independent shop rates): Repair an exhaust leak: $100–$350; Replace the catalytic converter: $800–$2,500; Replace an oxygen sensor: $150–$450. Overall, fixing P2572 usually costs between $100 and $2,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Common questions
What is the most common cause of P2572?
The most common causes are: exhaust leak ahead of the converter, faulty downstream or upstream oxygen sensor, engine misfires damaging the catalyst.
How much does it cost to fix P2572?
Repair an exhaust leak — $100–$350; Replace the catalytic converter — $800–$2,500; Replace an oxygen sensor — $150–$450. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
Will P2572 clear itself?
Sometimes P2572 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.
What does OBD2 code P2572 mean?
P2572 — Direct Ozone Reduction Catalyst Deterioration Sensor Circuit. A fault in the catalytic converter efficiency monitoring. The car is usually drivable while you plan the repair. Typical causes: exhaust leak ahead of the converter, faulty downstream or upstream oxygen sensor, engine misfires damaging the catalyst.
What are the symptoms of P2572?
Drivers most often notice: slight loss of power at high rpm, sulfur or rotten-egg smell from the exhaust, failed emissions test, Check Engine Light on.
What does P2572 mean?
When P2572 appears on a scan, it means the control module has flagged a problem in the catalytic converter efficiency monitoring: direct ozone reduction catalyst deterioration sensor circuit. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.
This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2572 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.
What causes P2572?
- aged or contaminated catalytic converter
- exhaust leak ahead of the converter
- engine misfires damaging the catalyst
- persistent rich or lean fuel mixture
- faulty downstream or upstream oxygen sensor
Common symptoms of P2572
- slight loss of power at high rpm
- sulfur or rotten-egg smell from the exhaust
- failed emissions test
- Check Engine Light on
- increased fuel consumption
How to diagnose P2572
- Connect an OBD2 scanner, confirm P2572 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Visually inspect the wiring harness and connectors related to the catalytic converter efficiency monitoring for damage, corrosion, chafing or poor contact.
- Compare upstream and downstream O2 sensor waveforms in live data — a healthy converter smooths the rear signal.
- Check for exhaust leaks and rule out misfire codes before condemning the converter.
- Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2572 does not return.
How to fix P2572
Start with the cheapest and most common causes before replacing expensive parts:
- Repair an exhaust leak — $100–$350
- Replace the catalytic converter — $800–$2,500
- Replace an oxygen sensor — $150–$450
How much does it cost to fix P2572?
Repair cost depends on which component actually failed. Typical scenarios for P2572 (parts and labor, USD, independent shop rates):
- Repair an exhaust leak: $100–$350
- Replace the catalytic converter: $800–$2,500
- Replace an oxygen sensor: $150–$450
Overall, fixing P2572 usually costs between $100 and $2,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Can you drive with P2572?
Usually safe to drive for a limited time: the car remains drivable, but emissions are elevated and fuel economy suffers. Do not postpone if you notice power loss, overheating of the exhaust, or a strong smell — a clogged converter can damage the engine.