What does the code P0404 mean?

Exhaust Gas Recirculation Circuit Range/Performance Issue
What Does Code P0404 Mean? P0404 definition: Exhaust Gas Recirculation Circuit Range/Performance. Issue Severity: MODERATE – Extended driving with this code may cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible.

What is EGR valve position sensor?

The EGR valve position sensor is a potentiometer which is used by the ECU to determine the position of the EGR valve. The potentiometer contains a carbon track over which a slider slides that is mechanically connected to the EGR valve.

Can I clean my EGR valve?

To clean the valve, wear an acid-resistant pair of gloves. Put on safety glasses, too, as the carbon deposits could become airborne in the process. Spray the EGR valve cleaner onto the carbon deposits. Remove the carbon buildup with the use of a pipe cleaning brush and dull scraper.

Can a P0404 cause a misfire?

When this occurs, you may notice misfires and even have misfire codes along with the P0404. This can occur on vehicles that use EGR “runners” for each cylinder.

Is a P0404 code bad?

How serious is the P0404 code? An EGR system that triggers this code the ECM may disable the EGR system and render it inoperative. The Check Engine Light being on causes the vehicle to fail emission testing. The EGR position is critical for the ECM to properly control EGR valve opening and closing.

What can cause an EGR valve to go bad?

The EGR system flow is excessive. The EGR valve mechanism is stuck open. The air filter is clogged or dirty. There are intake leaks. There could be a problem with the turbocharger.

Is it safe to drive with a faulty EGR valve?

The way to achieve this is to ensure your vehicle has a fully functional exhaust gas recirculation (EGR) valve in your vehicle’s EGR system. Driving around town with a faulty or damaged EGR valve can be dangerous to your vehicle, your health, and your environment.

What happens if the EGR valve is stuck open?

Open Position: Rough idling and problems with acceleration are the two most common indicators that the EGR valve is stuck open. The truck might also stall excessively. When the EGR valve is stuck open, all of the exhaust gas cycle back into the chamber, meaning there’s not enough oxygen for a combustion to take place.

What are the symptoms of a blocked EGR valve?

EGR valve symptoms can vary, however, the most common symptoms of a faulty EGR valve are explored below:

• Your engine has a rough idle.
• Your car has poor performance.
• You have increased fuel consumption.
• Your car frequently stalls when idling.
• You can smell fuel.
• Your engine management light stays on.

Can a blocked EGR cause limp mode?

A faulty EGR valve can result in excessive carbon/soot at the turbine end of the turbo charger. This could cause the VNT mechanism to become clogged and stick which in many cases will cause engine management lights to appears along with reduced performance known as “limp mode”.

What happens when EGR valve is stuck open?