This is an archived list of updates that have been announced on the OBD Codes home page.Dec 21/17 - P065A, P065B, P065C, P065D Dec 14/17 - P2430, P2431, P2432, P2433, P2434, P2435, P2436, P2437, P2438, P2439, P0655, P0656 Dec 5/17 - P0654 Nov 23/17 - P3405,...
1. Check Technical Service Bulletins:To diagnose the Check Engine code, the first step is to check for common known problems. Car manufacturers periodically issue Technical Service Bulletins (TSBs) that describe common problems for certain models. Some TSBs are posted on the internet; Google can h...
P0404:This DTC has to do with the vehicle’s EGR Control Circuit Range/Performance and tells you that your system’s valve or sensor isn’t working at the specified measurements. P0405:An EGR Sensor A Circuit Low engine code reveals your sensor is reading a low voltage level in your EGR...
LTFT values that drop down to negative 20 to 25 will usually set a P0172 or P0175 rich code.This scantool is displaying a STFT value of 25 percent. Normally that would indicate a problem, but in this case the engine is not running (Engine RPM is zero). As soon as the engine start...
be little or noticeable change in engine performance. However, because your engine management system was not calibrated to handle the richer fuel mixture that E85 requires, the engine computer may think something is wrong and set a P0171 or P0174 lean code and turn on the Check Engine light....