VIDEO: Diagnosing DTC P0401 EGR Insufficient Flow
TechShop Managing Editor Eric Garbe discusses diagnostic trouble code P0401 EGR Insufficient Flow.
The Code Reader: P0401
EGR (exhaust gas recirculation) is an emission control and prevents detonation when working properly. At high combustion temperatures, NOx (oxides of nitrogen) is formed.
Code Reader Podcast: P0401
P0401 sets when the control unit determines the EGR flow is less than expected based on the readings from different monitoring criteria.
EGR Issues: Dealing with P0401 Codes
ht=”245″ alt=”” align=”right” /> As emission controls got tighter, and with the advent of OBD II, things started to change. We not only saw additional driveability complaints, but we also had the check engine light (CEL) telling the customer there was an emissions failure that had to be dealt with for the good of the
Diagnosing Ford EGR System Modules
The EGR system module is one of Ford’s latest EGR systems for gasoline engines. It is an EGR valve, EVR, MAP and DPFE sensor rolled into one package. Grab your scan tool, contributing writer Glen Beanard explains how to diagnose problems in these systems.
Wells Vehicle Electronics Videos Exceed 3 Million YouTube Views
The award-winning automotive diagnostic videos created by Wells Vehicle Electronics have exceeded 3 million views on YouTube and are now being watched at a rate of more than 160,000 times per month.
Tech Update: Key Cycles and Codes
OBD II brought a lot of changes regarding how a technician diagnoses a vehicle. With OBD I, a failure had to occur in order to produce a service code, while OBD II can monitor failures or even partial failures. These days, codes have become part of the normal process in determining a fault. There are several different types of codes. Beyond engine, transmission, HVAC or body codes, there’s also a way to break down the priority of some of those codes.
Solving Common Honda Driveability Problems
One of the common check engine light problems you’ll encounter on Hondas is a misfire code with no apparent misfire. Many times, this problem will be traced back to tight valve lash. Obviously, a tight valve will pass the audible test every time. But, it’s the tight valves that will set the check engine light in the best case, and if it’s ignored long enough you’ll be looking at a low-compression situation caused by a burnt valve.
Getting a Grip on Traction Control
The basic principle of traction control is rather simple. A tire is breaking free and starting to spin so we’re going to place a drag on that wheel so that two things can happen. One is we want that tire to have a chance to regain its grip on the road surface. And two, we
Tech Tip: Hyundai has an Intermittently Stuck Closed EGR Solenoid Valve
Some vehicles (1999-2004 Sonata 2.4L, 2001-’04 XG300/XG350 and Santa Fe) with 2.4L or 3.5L engines may experience an intermittent unstable idle condition with the following symptoms ….