Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble reading the pressure of a special fluid needed to clean the car's exhaust. It's like when you can't tell how much juice is left in your juice box because the straw is bent.
The P20E1 code indicates an issue with the signal from the exhaust aftertreatment fuel pressure sensor, which is erratic or intermittent.
The exhaust aftertreatment system uses a fuel pressure sensor to monitor the pressure of the fuel used in the aftertreatment process. If the sensor's signal is inconsistent or erratic, the engine control module (ECM) will set a P20E1 code.
• Check Engine Light is on
• Reduced fuel efficiency
• Possible increase in emissions
• Faulty fuel pressure sensor
• Wiring issues such as damaged or corroded connectors
• ECM software issues
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code
• Inspect the wiring and connectors for damage
• Test the fuel pressure sensor for proper operation
• Replace the faulty fuel pressure sensor
• Repair or replace damaged wiring or connectors
• Update ECM software if necessary
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Ford F-Series
• Chevrolet Silverado
• Ram 1500
• Regular maintenance checks
• Ensure sensor connections are clean and secure
• Use quality fuel to prevent contamination
Sensor Issue
• Do not ignore the Check Engine Light
• Have the vehicle inspected by a professional
• Avoid driving long distances until the issue is resolved
Check with your vehicle manufacturer; emissions-related components may have extended warranties.
This code has become more common with the increased use of aftertreatment systems in modern vehicles to meet emissions standards.
Moderate – It should be addressed soon to avoid increased emissions and potential damage to the exhaust system.
Ignoring emissions-related codes can lead to failing emissions tests and potential fines in regions with strict emissions regulations.
• Engine at operating temperature
• Vehicle in a safe environment for testing
The exhaust aftertreatment fuel pressure sensor is typically located near the exhaust system, often close to the catalytic converter.
Q: Can I drive with a P20E1 code?
A: It's possible to drive short distances, but it's best to have it checked soon to avoid further issues.
Q: Will the Check Engine Light turn off after the repair?
A: Yes, once the issue is resolved, the light should turn off after a few driving cycles or can be reset with a scanner.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.