What causes the P0420 trouble code on a Ford Focus?

There are many things that can cause the P0420 trouble code in your Focus. Here are the most common ones. Oxygen Sensor – The P0420 codes is thrown when the oxygen sensors on both sides of the exhaust have very similar readings. When the oxygen sensor is bad, it can cause a false reading and trigger the code.

What is the trouble code on a Ford Focus?

One of the most common trouble codes with all Ford vehicles is the P0420. This code number references a number that is given to you when you plug your Ford Focus into a OBDII scanner. It doesn’t matter which model you have, this OBDII code has the same meaning for all of them. P0420 is a OBDII trouble code.

What does the OBDII code P0420 stand for?

P0420 is a OBDII trouble code. The code technically stands for: Catalyst System Efficiency Below Threshold. Your Focus has at least two oxygen sensors, one before and after the catalytic converter. Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter.

What’s the O2 sensor on a Ford Focus?

It’s most likely the O2 sensor, I’d be very surprised if it was your catalytic converter. Swap the sensor out and see how you get along. No worries, that’s good 🙂 it wouldn’t surprise me if it’s a bit of sort or something on the sensor.

What does P0420 mean on a Ford Focus?

P0420 FORD Tech Notes As the code description implies the P0420 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).

What causes the O2 sensor to show the code po420?

Rich or lean mixtures can damage the catalytic converter, and when the catalytic converter is damaged/filled with fuel, the efficiency will be low, and the rear O2 sensor will see that and show the trigger the code Po420.

Why does my Ford Focus not pass emissions?

If your vehicle has the P0420 code, it won’t pass emissions so please be aware of that. The P0420 code in a Ford Focus will often be thrown one of your oxygen sensors are not functioning properly.

What are the fault codes on a Ford Focus?

P1110 IAT sensor (D/C) open/short circuit P1113 IAT sensor (L/C) open/short circuit P1114 IAT – B circuit low input P1115 IAT – B circuit high input P1116 ECT (Engine Coolant Temperature) sensor out of self test range P1118 Manifold absolute temperature circuit low imput

Where is the P0420 OBD2 trouble code stored?

The front O2 sensor measures the mixture, and it tells the engine control unit if the engine is running with a rich or lean mixture and adjusts it. The rear O2 sensor is just a diagnostic O2 sensor for this trouble code. If the rear O2 sensor is getting faulty values, the p0420 code will get stored in the engine control unit.

How much does it cost to repair a P0420 Ford engine?

The cost of diagnosing the P0420 FORD code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour. When is the P0420 FORD code detected? – Three way catalytic converter Bank 1 does not operate properly.

Can a P0420 catalytic converter be replaced?

Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

What causes P0420 Ford catalyst system efficiency below threshold bank?

P0420 FORD – Catalyst System Efficiency Below Threshold Bank 1 Repair Importance Level: 2/3 Repair Difficulty Level: 2/3 P0420 FORD Possible Causes Faulty Three-way Catalyst Converter Bank 1 Exhaust Tube Intake Air Leaks Faulty Oxygen (O2) Sensor Faulty Fuel injector(s) Leaking Fuel Injector (s) Faulty Spark plugs Improper Ignition Timing

How can I fix the P0420 code on my catalytic converter?

To fix the P0420 code, you need to diagnose what is causing the trouble code. Start with inspecting and diagnosing your catalytic converter and continue with checking the O2 sensors. What can cause a P0420 code? A bad catalytic converter is the most common cause of the p0420 code.

How does the p0320 code work on a Ford?

The P0320 code is triggered when the Engine Control Module (ECM) detects that there is no current at the ignition coil group

What causes a p0320 Ford distributor to malfunction?

P0320 FORD Possible Causes 1 Faulty Ignition/Distributor engine speed sensor 2 Faulty Crankshaft Position sensor 3 Ignition/Distributor engine speed sensor harness is open or shorted 4 Ignition/Distributor engine speed sensor circuit poor electrical connection 5 Low battery charge 6 Faulty Engine Control Module (ECM)

How much does it cost to diagnose the p0320 Ford code?

The cost of diagnosing the P0320 FORD code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour. When is the P0320 FORD code detected?

What causes the P0420 trouble code on a Ford Focus?