JC Landry, Author at eManualOnline Blog

JC Landry

JC is the Senior Editor at eManualOnline.com, GarageSpot.com, and Drive-My.com, as well as the Webmaster of TheMechanicDoctor.com, only to name a few. He's been a certified Master Mechanic for 15 years, working for various car dealers and specialized repair shops before turning towards blogging about cars and EVs in the hope of helping the next generation of automotive technicians. He also loves cats, Johnny Cash and Subarus.

P20ED OBD2: SCR NOx Pre-Catalyst – Over Temperature

JC Landry June 18, 2025

Learn all about the P20ED code, what causes SCR NOx pre-catalyst over temperature, and how to diagnose and fix common issues to maintain optimal engine performance.

P20EE OBD2: SCR NOx Catalyst Efficiency Below Threshold

JC Landry June 17, 2025

Learn all about the P20EE code, what causes SCR NOx catalyst efficiency below threshold, and how to diagnose and fix common issues to maintain optimal engine performance.

P20EF OBD2: SCR NOx Pre-Catalyst Efficiency Below Threshold

JC Landry June 17, 2025

Learn all about the P20EF code, what causes SCR NOx pre-catalyst efficiency below threshold, and how to diagnose and fix common issues to maintain optimal engine performance.

P20F0 OBD2: SCR NOx Catalyst – Over Temperature

JC Landry June 17, 2025

Learn all about the P20F0 code, what causes SCR NOx catalyst over temperature, and how to diagnose and fix common issues to maintain optimal engine performance.

P20F1 OBD2: SCR NOx Pre-Catalyst – Over Temperature

JC Landry June 17, 2025

Learn all about the P20F1 code, what causes SCR NOx pre-catalyst over temperature, and how to diagnose and fix common issues to maintain optimal engine performance.

P20F2 OBD2: SCR NOx Catalyst Efficiency Below Threshold

JC Landry June 17, 2025

Learn all about the P20F2 code, what causes SCR NOx catalyst efficiency below threshold, and how to diagnose and fix common issues to maintain optimal engine performance.

P20F3 OBD2: SCR NOx Pre-Catalyst Efficiency Below Threshold

JC Landry June 17, 2025

Learn all about the P20F3 code, what causes SCR NOx pre-catalyst efficiency below threshold, and how to diagnose and fix common issues to maintain optimal engine performance.

P20F4 OBD2: Reductant Consumption Too Low

JC Landry June 17, 2025

Learn all about the P20F4 code, what causes reductant consumption too low, and how to diagnose and fix common issues to maintain optimal engine performance.

P20F5 OBD2: Reductant Consumption Too High

JC Landry June 17, 2025

Learn all about the P20F5 code, what causes reductant consumption too high, and how to diagnose and fix common issues to maintain optimal engine performance.

P20F6 OBD2: Reductant Injection Valve Stuck Open

JC Landry June 17, 2025

Learn all about the P20F6 code, what causes reductant injection valve stuck open, and how to diagnose and fix common issues to maintain optimal engine performance.