Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that the car's computer thinks there's too much pressure in the exhaust system on one side of the engine. It's like trying to blow air through a straw that's blocked.
The P28F7 code indicates that the exhaust pressure sensor has detected a pressure level that is higher than the expected range in the exhaust system of Bank 1.
The exhaust pressure sensor monitors the pressure within the exhaust system. When the pressure exceeds the manufacturer's specified limits, the engine control module (ECM) triggers the P28F7 code. This could be due to a blockage or malfunction in the exhaust system components such as the catalytic converter or exhaust manifold.
• Reduced engine performance
• Poor fuel economy
• Check Engine Light illuminated
• Blocked or clogged catalytic converter
• Faulty exhaust pressure sensor
• Exhaust manifold blockage
Bank 1: The side of the engine with cylinder 1.
Exhaust Pressure Sensor: A sensor that measures the pressure in the exhaust system.
• Use an OBD-II scanner to confirm the code.
• Inspect the exhaust system for blockages or damage.
• Test the exhaust pressure sensor for proper operation.
• Replace the exhaust pressure sensor if faulty.
• Clear blockages in the exhaust system.
• Replace the catalytic converter if clogged.
• OBD-II scanner
• Multimeter
• Exhaust backpressure gauge
$200 - $1200
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regularly inspect the exhaust system.
• Use quality fuel to prevent buildup.
• Perform routine vehicle maintenance.
Engine Performance
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for accurate diagnosis.
Check with the vehicle manufacturer for warranty coverage on exhaust components.
This code has been associated with exhaust system issues in vehicles with high mileage or poor maintenance history.
High – Continued driving can lead to engine damage or reduced performance.
Driving with a malfunctioning exhaust system can lead to harmful emissions and is illegal in many areas.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The exhaust pressure sensor is typically located near the exhaust manifold or catalytic converter on Bank 1.
Q: Can I drive with a P28F7 code?
A: It's not recommended to drive with this code as it can cause further engine damage.
Q: How do I clear the P28F7 code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the underlying issue is resolved first.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
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Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
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