How is fault code P042E fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Read live data and compare commanded EGR position against actual position. If the actual stays open while commanded closed, the valve or its feedback is your problem 2. Pull every code that's stored. Misfire codes, boost faults or a P042F sitting alongside this usually point at the same coked-up valve 3. Get the valve off and look at it. Heavy black carbon on the seat that stops the plunger closing tells you most of what you need to know before you spend a penny 4. Check the EGR passages and the throat into the intake while the valve is off. A clean valve won't help if the port behind it is choked solid 5. Inspect the wiring and connector for corrosion, melted insulation or a loose pin, particularly on engines where the loom runs close to the manifold 6. With the valve out, test the solenoid and position sensor resistance with a multimeter and back-probe the supply and signal feeds with the loom connected

Gas RecirculationAControl Stuck Open

Jump to the fix

Severity

Low

Can I keep driving?

Usually drivable; have it fixed at the first opportunity.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Read live data and compare commanded EGR position against actual position. If the actual stays open while commanded closed, the valve or its feedback is your problem 2. Pull every code that's stored.

PPowertrain
0Generic code
4Emissions
2ESequence number

What does it mean?

P042E is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Exhaust Gas Recirculation A Control Stuck Open . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.