That being said, it can be a simple electrical issue with the powertrain control module or the heated O2 sensor in many cases. But, it can also be a sign that too much fuel is being injected. This can be the result of incorrect air intake. A failed test implies there isn’t enough fuel blending with the air. As we mentioned before, this sensor tests the amount of oxygen to make sure the air-to-fuel mixture is accurate. Your vehicle’s heated oxygen sensor will signal you with this trouble code. Lack of upstream heated O2 sensor switch indicates lean in bank 2. If the HO2S2 signal is under the voltage range for a prolonged period, the P1137 Ford code will be displayed. The HO2S2 displays a voltage over 0.45 V, and the PCM interprets that as rich. In contrast, if the O2 content in the exhaust gas reduces, the air-to-fuel mixture becomes rich. The PCM understands lean when the heated O2 sensor shows a voltage reading below 0.45 V. If the level of oxygen increases, the air-to-fuel mixture becomes lean. The HO2S2 generates a voltage of 0.1 to 0.9 V in response to the O2 found in the exhaust gas. The Powertrain Control Module, or PCM, regulates the fuel injection time to maintain the stoichiometric level of the air-to-fuel ratio. An error like this indicates a lean condition, meaning there is an excess of air in the fuel-to-air mixture. When the ratio is perfect, it leads to lesser exhaust emissions and improved fuel economy. The job of the O2 sensor is to calculate the volume of oxygen in the exhaust and decide whether the fuel-to-air ratio in the cylinder is too lean or too rich.

In short, a P1131 Ford code indicates an issue with the O2 sensor in a Ford vehicle. Therefore, you must be particular in your search and consider your vehicle’s make. The heated oxygen sensor voltage is below 0.45V since the upstream O2 sensor is not changing lean to rich and vice versa as frequently as it should.Īny Error Code that begins with P1xxx is a manufacturer-specific diagnostic trouble code. This trouble code tells drivers that the system is fixing the overly “lean” situation with a “rich” one in the air-to-fuel ratio of the engine. FAQs P1131 Ford Code: What Does It Mean?Įrror Code P1131 is displayed when sensor 1 or the oxygen sensor bank 1 does not switch enough to lean.This article will discuss everything about the P1131 Ford code, from what it means to diagnosis and fixes. It is one of the more commonly displayed codes for Ford vehicles and is prevalent in Ford Explorer, Ford Ranger, Ford Escort, Ford Mustang, and Ford F150. The P1131 Ford code is linked to the oxygen sensor and signals the engine is running on a lean or rich fuel mixture. While this may seem harmless at first, keep it hanging for long enough, leading to part damages and decreased fuel economy. P1131 is amongst many of the OBD2 Diagnostic Trouble Codes that may be displayed on your Ford.

Ford engine codes p1131