Fix P202E: STEP-BY-STEP diagnostic GUIDE!

The P202E: Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1 refers to an issue with the performance or range of the reductant injection valve responsible for dosing DEF (Diesel Exhaust Fluid) into the exhaust system. This could be due to a faulty valve, wiring issues, or connector problems affecting its operation.

P202E – Quick Overview

CodeInformation
MeaningP202E: Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1
Is it serious?Yes, this issue can reduce the effectiveness of the SCR (Selective Catalytic Reduction) system, potentially leading to higher NOx emissions and failing emissions tests.
Possible causes– Faulty reductant injection valve
– Incorrect valve performance
– Wiring or connector issues
How to diagnose?– Test the reductant injection valve for range and performance
– Inspect wiring and connectors
– Verify valve operation

P202E Meaning

The P202E: Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1 code indicates that the reductant injection valve for Bank 1 Unit 1 is not operating within the expected performance range. This valve injects DEF into the exhaust to reduce NOx emissions. A fault in the valve or its control circuit can impair the vehicle’s emission control system, leading to increased emissions.

Step-by-step diagnostic guide

ActionDescriptionTools Needed
Check for Other CodesUse an OBD-II scanner to look for additional codes related to the reductant system or emission control components. These codes may offer further insight into the issue.OBD-II Scanner
Test the Reductant Injection ValveUse a diagnostic tool to test the operation of the reductant injection valve for Bank 1 Unit 1. Ensure it is opening and closing as expected, and delivering the correct amount of reductant.Diagnostic Tool
Inspect Wiring and ConnectorsVisually inspect the wiring and connectors leading to the reductant injection valve. Look for any damage, corrosion, or loose connections that could be affecting the valve’s performance.Flashlight, Multimeter
Check for Valve BlockagesInspect the reductant valve and its lines for blockages or restrictions that could impair DEF delivery. Clean or replace any blocked components as necessary.Flashlight, DEF Cleaning Solution
Test Valve Circuit ContinuityUse a multimeter to check for continuity in the wiring circuit connected to the reductant valve. Make sure there are no shorts or open circuits that could affect valve operation.Multimeter
Verify Valve CalibrationEnsure the reductant injection valve is properly calibrated using a diagnostic tool. If the valve is out of calibration, it may need to be adjusted or replaced.Diagnostic Tool
Repair or Replace Faulty ComponentsIf the valve, wiring, or connectors are damaged or faulty, repair or replace them to restore proper operation of the reductant injection valve.Wiring Repair Kit, Valve Replacement
Clear the Code and Test DriveAfter repairs are made, clear the P202E code using an OBD-II scanner. Take the vehicle for a test drive to confirm that the valve is working properly and the issue has been resolved.OBD-II Scanner, Vehicle Owner’s Manual
Recheck for CodesAfter the test drive, re-scan the vehicle to verify that the P202E code has not returned.OBD-II Scanner
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