The oxygen sensor checks how much oxygen there is in the exhaust gases produced by the engine burning a mixture of air and fuel. It converts the oxygen content into a voltage signal and sends it to the engine control module (ECM) or powertrain control module (PCM). The controller uses the readings to adjust various engine and fuel system processes, thereby achieving the most fuel-efficient operation.
If the control circuit powering oxygen sensor #1 on engine bank 1 showed a negative current, the PCM will log a P2252 code.
What Does the P2252 Code Mean?
The diagnostic trouble code (DTC) P2252 indicates “O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 1.” Bank 1 indicates the side of the engine with cylinder 1. Oxygen sensor 1 refers to the upstream device located in front of the catalytic converter.
Modern vehicles have multiple O2 sensors. Preheated by battery voltage to get them into operational condition, the sensors measure the oxygen content in the exhaust gases as the latter enter and exit the catalytic converter.
The oxygen sensors send voltage signals corresponding to the amount of oxygen detected. Higher voltage outputs indicate less oxygen, which indicates the exhaust gases are rich. Conversely, lower voltage outputs indicate the exhaust is lean.
The PCM regularly checks the oxygen sensors. If the voltage reading from the O2 sensor #1 is much lower and doesn’t match the right parameters, it will set the generic code P2252. It can take more than one ignition cycle before the controller activates the check engine light or malfunction indicator lamp.
Note: The definition of code P2252 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
What are the Common Causes of a Code P2252?
- Bad oxygen sensor
- Leak in the exhaust system
- Faulty PCM
- Problems with the wiring of the O2 sensor
What are the Common Symptoms of a Code P2252?
- Illuminated check engine light
- Poor engine performance
- Higher fuel consumption and wastage
How to Diagnose the P2252 Code
The P2252 code is a generic code that can be logged by different makes and models. Despite its prevalence, the process to determine its exact issue and the steps to fix it can vary between vehicles. What works in one instance may not apply to a different case.
If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself.
How to Fix the P2252 Code
You will need the correct tools and appropriate knowledge to effectively repair the problem with the oxygen sensor that caused the P2252 code. In most cases, it’s best to leave the job to professionals.
DIYers with advanced technical knowledge and hands-on experience can personally test and replace their vehicle’s O2 sensors. To make the job easier, they can refer to the right repair manual or consult an online repair database.
Buying a Replacement Oxygen Sensor to Clear Code P2252
Though there are many ways to fix DTC P2252, the simplest method revolves around repairing or replacing parts that aren’t working as intended. In some cases, replacing a faulty oxygen sensor is needed. Luckily, you can get a replacement that’s compatible with your vehicle easily thanks to CarParts.com.
The best part? You don’t even have to take one step outside your door to get your hands on a new sensor. Use our built-in vehicle selector to narrow down your choices to the parts compatible with your ride.
We carry parts from the industry’s top manufacturers, so you can shop for OE-quality parts without breaking the bank. Place your order in a jiffy, and expect it to arrive in a matter of days.
Spare yourself the time and trouble of driving from one store to another by shopping for replacement parts online. Browse our collection of high-quality oxygen sensors today!
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