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P2574 is a diagnostic trouble code (DTC) for "Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Low4". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P2574 trouble code is an indication that the direct ozone reduction catalyst deterioration sensor or circuit has encountered a varying degree of voltage. The Powertrain Control Module (PCM) has thus stored the trouble code and has illuminated the Check Engine Light. In addition to the P2574 trouble code, mechanics should look for the following, related trouble codes, including P2567, P2568, P2569, P2570, P2571, P2572, P2573, P2575, P2576, and P2577.
Using data from the upstream and downstream oxygen sensors, the PCM calculates the degree of ozone reduction for each catalytic converter. When this amount is not where it should be, a P2574 trouble code gets stored on the PCM and the Check Engine Light illuminates.
A faulty direct ozone reduction catalyst deterioration sensor is the most common reason for storage of this trouble code. If a bad oxygen sensor is the culprit, the mechanic should expect an oxygen sensor code to accompany the P2574 code. The mechanic should also look for contributing factors that can cause this code since a direct ozone reduction catalytic converter is not designed to wear out. These contributing factors include a faulty mass flow, coolant temperature, or manifold air pressure sensor; problems with fuel quality or the fuel system; and issues with the ignition system, such as incorrect spark timing or an ignition misfire. Finally, a leak in the exhaust system can sometimes fool the PCM into thinking that the direct ozone reduction catalyst has failed.
Symptoms of a P2574 trouble code run the gamut from only a code storage followed by an illumination of the Check Engine Light to a no start or engine stall condition. Vehicle drivability can become an issue as well, with engine hesitation, poor performance, or a hissing sound present upon acceleration common problems with advanced forms of the conditions that cause this code.
Diagnosing a P2574 trouble code is an involved process starting with an inspection of the exhaust system for any leaks. If no leaks are detected, a mechanic should use a OBD-II code scanner, temperature gun, and digital volt/ohmmeter for further diagnosis. When diagnosing a P2574 trouble code, perform the following steps:
Leaving the underlying cause of the storage code untreated can lead to repeated reoccurrences of a P2574 trouble code. Mechanics should repair and clear related trouble codes first before trying to clear a P2574 trouble code. They can determine the order of the storage of various trouble codes by downloading the freeze frame data and any stored codes from the PCM.
The storage of a P2574 trouble code can lead to, among other things, a engine no start or stalling condition. Sometimes, engine hesitation, lowered performance, and problems with acceleration also accompany this code.
Once a diagnosis has been made by the mechanic, they should attempt to repair the problem in order to clear the code, including the following repairs:
Before attempting to diagnose a P2574 trouble code, the mechanic should check to ensure that the direct reduction catalyst is not under warranty, with many having a 100,000-mile federally mandated warranty.
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