BMW fault code: P0171, P0174 – System too lean This fault code indicates that the air-fuel mixture ratio is unusual, leaning towards too much air or too little fuel. Numerous components could be at fault, ranging from failure to close the fuel tank cap to a faulty oxygen sensor. Lookin...
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,...
P0402: The EGR Flow Excessive Detected code means there is too much recirculated exhaust gas flowing through the system. P0403: When you see this code, your vehicle has a short or open circuit in the vacuum control solenoid or wiring. P0404: This DTC has to do with the vehicle’s ...
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...
LTFT values that get up around 20 to 25 percent will usually set a P0171 or P0174 lean code. 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...
should 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 leancodeand turn on the Check Engine ...