P2193 code definition
System Too Lean at Higher Load Bank 2
What the P2193 code means
P2193 is an OBD-II generic code for the Engine Control Module (ECM) detecting the fuel control has reached its rich limits when the engine is under a heavy load on bank 2.
What causes the P2193 code?
The ECM controls the fuel using a closed loop feedback system. Therefore, the system is trying to enriched the fuel mixture and the O2 sensor keeps saying the system is too lean on bank one. If the system reaches 25% enrichment and the O2 sensor still indicates the system is lean, then the Check Engine Light is turned on and the code P2193 is set.
The fuel injection system on bank one is clogged causing the lean condition.
What are the symptoms of the P2193 code?
The Check Engine Light will be illuminated and the code is set in the ECM memory as a fault.
The engine will run lean on bank two and the engine may run rough and misfire.
The engine may hesitate on acceleration.
How does a mechanic diagnose the P2193 code?
Scan for codes and document the codes in the ECM and look at the freeze frame data for failure.
Monitor the O2 sensors for bank 2 while manually enriching the mixture with propane to see if the O2 sensor indicates rich.
Remove all spark plugs on bank 2 of the engine and check to see if any plug is running lean, indicating a problem cylinder.
Follow the manufacturer pinpoint tests for the diagnosis and replacement of the clogged or defective injector for the lean running cylinder.
Common mistakes when diagnosing the P2193 code?
Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.
Failing to clear the ECM codes after the codes are fixed, so the ECM will enable the system to be normal again.
Failing to clean the injectors, if cleaning it would have fixed the problem.
How serious is the P2193 code?
Code P2193 is a code indicating that the engine is running lean on only one side. This lean condition can cause internal engine damage or cause the engine to misfire.
What repairs can fix the P2193 code?
- Replacing one or more of the injectors for bank two.
- Cleaning all the injectors for both banks of the engine.
- Replacing the O2 sensor for bank two.
- Rechecking the system to make sure it does not run lean under a load.
Additional comments for consideration regarding the P2193 code
Code P2193 is for a lean running engine on bank two and the most common problem is the injectors getting clogged over time. As they clog over time, the engine will compensate by running the injectors richer to bring the system back to normal. Once the ECM has richened the fuel as much as it can, then it will set the code. Most fuel controls can go lean or rich up to 25% before the limit is reached.
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