Helpful Automotive Resources
P0170 Code: Fuel Trim (Bank 1)P0170 is a common issue among the following makes: Mercedes Benz (especially on a Mercedes Benz W203), Honda, Ford, BMW, and Hyundai.
P2187 Code: System too Lean at Idle (Bank 1)In an internal combustion engine, the air-fuel mixture is controlled by the powertrain control module (PCM). The PCM uses a closed-loop air-fuel metering system and monitors the heated oxygen sensor signal voltage. It utilizes various data from the sensors in the car, such as the oxygen sensors, manifold absolute pressure P0104 Code: Mass Air Flow (MAF) “A” Circuit Intermittent / ErraticA mass air flow sensor monitors the amount of air entering the engine. The PCM collects data from this sensor to help determine the amount of fuel needed by the engine at a given time. The right air-to-fuel ratio is essential to achieving optimal engine performance.
Symptoms of a Bad Mass Air Flow SensorBecause the MAF is a primary input to your car’s computer for fuel control (more on that later), the sensor can cause several noticeable symptoms when it fails. Some of the most common air flow sensor problems include:
Illuminated Check Engine Light
P0113 Code: Intake Air Temperature Sensor 1 Circuit High InputThe computer, which is often referred to as the powertrain control module (PCM), uses the IAT to observe the temperature of the air going into the engine. In most cases, the device sends a 5-volt reference voltage to the IAT sensor, a thermistor whose electrical resistance changes according to the