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 a signal from the engine that helps it know how well the engine is working. It's like trying to watch a TV show with a bad signal.
The P1373 code indicates a problem with the ionic current signal amplification control circuit on bank 2 of the engine, which affects the engine's ability to monitor combustion quality.
The ionic current signal is used to monitor combustion quality in the engine cylinders. The control circuit for this signal on bank 2 is reading a low voltage, which means it might not be functioning correctly. This can affect engine performance and efficiency.
• Check Engine Light is on
• Poor engine performance
• Increased fuel consumption
• Faulty ionic current sensor
• Wiring issues in the signal circuit
• Faulty engine control module (ECM)
Ionic Current: An electrical current used to monitor combustion quality in an engine.
Bank 2: The side of the engine that does not contain cylinder 1 in a V-type engine.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections for the ionic current sensor on bank 2.
• Test the ionic current sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the ionic current sensor if faulty.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Repair manual specific to the vehicle
$150 - $500
Moderate
• Saab 9-5
• Saab 9-3
• Some GM models
• Regular maintenance checks
• Ensure proper engine tuning
• Inspect electrical connections periodically
Sensor Issue
• Avoid driving the vehicle until the issue is diagnosed.
• Consult a professional mechanic if unsure about repairs.
Check if the vehicle's powertrain warranty covers sensor-related issues.
This code is more common in vehicles with advanced ignition systems that use ionic current sensing for combustion monitoring.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with a malfunctioning engine sensor can lead to increased emissions and potential safety hazards.
• Engine running
• Vehicle at normal operating temperature
The ionic current sensor is typically located near the ignition coils on bank 2 of the engine.
Q: Can I drive with a P1373 code?
A: It's not recommended to drive for long periods with this code, as it can affect engine performance and efficiency.
Q: How do I reset the P1373 code?
A: You can reset the code using an OBD-II scanner, but it's important to fix the underlying issue first.
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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
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
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.