Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P2572 OBD-II Trouble Code: Direct Ozone Reduction Catalyst Deterioration Sensor Circuit 4

P2572 OBD-II Trouble Code: Direct Ozone Reduction Catalyst Deterioration Sensor Circuit 4

Check Engine Light

What the P2572 code means?

P2572 is an OBD-II generic code for the engine control module (ECM) detecting the ozone reduction catalyst has deteriorated or the sensor has failed. Some problems may be from a defective regeneration system on diesel engines.

What causes the P2572 code?

  • The ECM monitors the catalyst with sensors that measure the operation of the catalyst. When the catalyst sensor detects the catalyst, it will fall below specified limits for ozone reduction then it will turn on the Check Engine light and set the code P2572.

  • The catalyst is not operating correctly or the substrate inside it is contaminated or broken, allowing uncleaned exhaust to pass through it.

  • The catalyst sensor is not working to detect O2 levels and causing the failure.

What are the symptoms of the P2572 code?

  • The Check Engine light will be illuminated and the code is set in ECM memory as a fault. The light will stay on unless the problem goes away for at least 3 engine key cycles.

  • The vehicle may have reduced power due to the ECM failure strategy.

  • The vehicle may have rattling in the exhaust if the catalyst is broken apart.

  • The catalyst may glow red hot if the catalyst is plugged or partly melted.

How does a mechanic diagnose the P2572 code?

  • Scans for codes and documents the code in the ECM and looks at the freeze frame data for the problem before clearing the codes and retesting.

  • Runs the regeneration of the catalyst on diesel engines than have this option.

  • Checks all the O2 sensors for correct readings and notes any problems to be diagnosed.

  • Checks the exhaust for broken catalysts or O2 sensor wires burned.

  • Removes the catalyst sensor and looks for contaminations from a bad catalyst.

  • Checks the connector and wiring for corrosion causing an open or short in the sensor circuit.

Common mistakes when diagnosing the P2572 code

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

  • Failing to clear the ECM codes after the codes are fixed

  • Failing to run the regeneration for diesel engines before condemning the catalyst

How serious is the P2572 code?

Code P2572 is an indication that the ECM has got sensor signals that the catalyst is not cleaning the exhaust before it leaves the exhaust. This will fail an emission test.

What repairs can fix the P2572 code?

  • Run the regeneration to clean the catalyst in most newer diesel engines.
  • Repair the catalyst sensor connector pins for corrosion, melted or loose connections.
  • Replace the O2 sensor behind the catalyst.
  • Replace the catalyst and sensor.

Additional comments for consideration regarding the P2572 code

Code P2572 is for the catalyst sensor for some diesel engines and the code can be due to the regeneration of the exhaust and has not run or the system has problems that need fixing for it. The regeneration system cleans soot from the exhaust catalyst and allows it to work cleaning the exhaust of ozone pollutants again.

Need help with a P2572 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Symptoms of a Bad or Failing Flexible Clutch Hose
Common signs include difficulty shifting, low clutch fluid, and feeling no resistance at the clutch pedal.
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....


Related questions

Q: EPC light

Any number of dozens of sensors, control modules, or computers can be causing your issue. Including the oil pressure switch being disconnected. The only way to know why exactly the light is coming on is to have the system scanned...

Q: Check Engine Light on code P3400 showing

Hello. This particular code indicates a performance issue with the cylinder deactivation system on bank 1. If you believe that all of the recent repairs are holding, then you may want to turn your attention the the solenoid and sensor...

Q: P0443

Hi. There are evaporative hoses that run from the purge valve to the charcoal canister that could also have a leak in them causing the code p0443 to still be there. There also could be a problem with the charcoal...