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.

P0037 OBD2: Heated Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

JC Landry September 13, 2025

P0037 OBD2: HO2S Heater Control Circuit Low

Learn all about the P0037 code, what causes HO2S heater control circuit low, and how to diagnose and fix common issues to maintain optimal engine performance.

P0038 OBD2: Heated Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)

JC Landry September 13, 2025

P0038 OBD2: HO2S Heater Control Circuit High

Learn all about the P0038 code, what causes HO2S Heater Control Circuit High, and how to diagnose and fix common issues to maintain optimal engine performance.

P0039 OBD2: Turbocharger/Supercharger Bypass Valve Control Circuit

JC Landry September 13, 2025

Learn all about the P0039 code, what causes turbocharger/supercharger bypass valve control circuit issues, and how to diagnose and fix common problems to maintain optimal engine performance.

P003A OBD2: Turbocharger/Supercharger Boost Control “A” Position Exceeded

JC Landry September 13, 2025

Learn all about the P003A code, what causes turbocharger/supercharger boost control issues, and how to diagnose and fix common problems to maintain optimal engine performance.

P003B OBD2: Turbocharger/Supercharger Boost Control “B” Position Exceeded

JC Landry September 13, 2025

Learn all about the P003B code, what causes turbocharger/supercharger boost control "B" position exceeded, and how to diagnose and fix common issues to maintain optimal engine performance.

P003C OBD2: “A” Camshaft Profile Control Performance/Stuck Off

JC Landry September 13, 2025

Learn all about the P003C code, what causes "A" camshaft profile control performance issues, and how to diagnose and fix common problems to maintain optimal engine performance.

P003D OBD2: “A” Camshaft Profile Control Stuck On

JC Landry September 13, 2025

Learn all about the P003D code, what causes "A" camshaft profile control stuck on, and how to diagnose and fix common issues to maintain optimal engine performance.

P003E OBD2: “A” Camshaft Profile Control Performance/Stuck Off

JC Landry September 13, 2025

Learn all about the P003E code, what causes "A" camshaft profile control performance issues, and how to diagnose and fix common problems to maintain optimal engine performance.

P003F OBD2: “A” Camshaft Profile Control Stuck On

JC Landry September 13, 2025

Learn all about the P003F code, what causes "A" camshaft profile control to be stuck on, and how to diagnose and fix common issues to maintain optimal engine performance.

P0040 OBD2: O2 Sensor Signals Swapped (Bank 1 Sensor 1/Bank 2 Sensor 1)

JC Landry September 13, 2025

Learn all about the P0040 code, what causes O2 sensor signals to be swapped, and how to diagnose and fix common issues to maintain optimal engine performance.