Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer thinks there's too much fuel being used before the second set of engine parts that clean the air. It's like if you were putting too much syrup on your pancakes.
The engine control module (ECM) has detected that the fuel mixture is too rich in the pre-catalyst section of the exhaust system on Bank 2.
P1093 indicates that the ECM has found an excessively rich air/fuel mixture in the pre-catalyst area of Bank 2. This means that there is too much fuel and not enough air in the mixture, which can lead to inefficient combustion and increased emissions.
• Check Engine Light is on
• Poor fuel economy
• Black smoke from the exhaust
• Faulty oxygen sensor
• Leaking fuel injector
• Faulty fuel pressure regulator
ECM: Engine Control Module
Bank 2: The side of the engine opposite Bank 1, typically the side without cylinder 1.
• Use an OBD-II scanner to confirm the code.
• Inspect the oxygen sensor and wiring for damage.
• Check the fuel pressure and inspect the fuel injectors.
• Replace the faulty oxygen sensor.
• Repair or replace leaking fuel injectors.
• Replace the fuel pressure regulator if faulty.
• OBD-II scanner
• Multimeter
• Fuel pressure gauge
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular maintenance checks
• Timely replacement of oxygen sensors
• Ensure proper fuel system maintenance
Engine Performance
• Do not ignore the Check Engine Light.
• Seek professional diagnosis if unsure.
• Regularly maintain your vehicle to prevent such issues.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
P1093 is a relatively common code for vehicles with advanced fuel systems, often related to aging components.
Moderate – Should be addressed soon to prevent further engine issues.
Driving with a rich fuel mixture can increase emissions and may not pass emissions tests.
• Engine at operating temperature
• Vehicle idling
The oxygen sensor is located in the exhaust manifold of Bank 2, before the catalytic converter.
Q: Can I drive with a P1093 code?
A: It's not recommended to drive for extended periods as it can lead to further engine issues.
Q: What happens if I ignore the P1093 code?
A: Ignoring the code can lead to poor fuel economy, increased emissions, and potential damage to the catalytic converter.
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Fitment Required · Vehicle-fitment part
Relevant when the code or supporting diagnostics point toward upstream or downstream oxygen-sensor faults.
This code family often involves upstream or downstream oxygen-sensor diagnosis.
Verify exact sensor position and vehicle fitment before buying.
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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.