What can cause a P0170 code?

The PCM may log the P0170 code for the following reasons: Contaminated Engine Oil (too long since the last oil change) A leaking injector. Excessive fuel pressure due to restriction along the fuel return line or a faulty fuel pressure regulator.

Can a bad O2 sensor cause P0170?

If the O2 sensor says it needs more fuel, then the PCM will carry out a positive trim. Error Code P0170 is set when the PCM has detected an anomaly on fuel (fuel trim) that is outside the range of the vehicle’s specifications. This can be a negative or positive trim.

What is Mercedes MAF?

The Mass Airflow Sensor, MAF, is a key component in the process of the movement of fuel into and through your engine. It measures the amount of air entering the engine (airflow). It works by a small, electrically-heated wire positioned next to a temperature sensor.

How do I find my Mercedes fault code?

Go to Mercedes > Select Model. Go to Auto Scan. Allow the scanner to go through all the systems and determine fault codes stored on each one. This will take a few minutes.

What causes fuel trim problems?

Short-term fuel trim happens as a result of changes in the oxygen levels of exhaust gases. An oxygen sensor monitors the flow and generates a signal that is proportional to the oxygen levels in the gases. In a properly functioning system, the ECU will react and immediately make changes as the exhaust gases change.

How do you read a fuel trim on a scanner?

The fuel trim value is read by plugging a scan tool into the OBD II diagnostic connector located under the instrument panel (on the drivers side near the steering column). When the key is turned on, the scan tool will initialize and start to communicate with the vehicle’s onboard computer.

What is the fuel trim?

What is Fuel Trim? Fuel trims are what engine control system use to compensate for all problems relating to air-fuel ratios (known as λ or lambda,) and combustion. The Electronic Control Module (ECM) or Powertrain Control Module (PCM) uses a few sensors to determine how much air is flowing into the engine.

How do you clear a Mercedes fault code?

The first way to reset a check engine light on your Mercedes-Benz is with a scanner. If you have one, simply plug it in, read the related codes, and press “clear” or “reset.” So long as the code issue has been resolved, it should go off.

Can I drive my Mercedes with check engine light on?

If you’re wondering, “Can I drive my Mercedes-Benz with the check engine light on?”, you certainly can if this is your problem. That said, you should bring your vehicle in immediately because a faulty oxygen sensor can damage your catalytic converter, which is costly to replace.