What does OB2 code P1166 mean on a 2003 Honda CR-V?

Answer 1

This means that one of the oxygen sensor is having problems. In Honda CRV there are two O2 sensors. Typically OEM Sensor and replacement may costs from 300 to 400$. However, when you get Emission check light, it basically tells you that Emissions are either rich or lean of fuel in exhaust. On board Computer tries to burn the fuel (14.7 part Air to 1 part fuel) optimally to reduce polution and achieve highest efficientcy. O2 attached in the exhaust system senses and send the feedback to computer continuosly. Before you rush to dealer and they rip you off, you can do several things : - Check your Gas Tank cap. Loose gas tank is primary cause for this first time. Tighten the cap. Take about 2 to 3 trips or 20 to 40 miles. There is a good chance that this check will go away if loose cap was the isssue. - Disconnect the battery cables and let the reset occur ( 10 to 15 min). If may clear the light - If comes back on again, remember when did you change the Air filter ? Change it. $15 Air filter may save to you couple of hundred $$ - Remeber when you replaced the battery. The sensor is fed battery voltage for measurement. If the battery is older than four to five years, I would suggest to change the battery so any reduction in standard 12V+ is not causing this wrong reading from sensor - O2 Sensors operate at very high temperature and very sensitive. If you dare go underneath you car, you can easily spot two O2 sensors, try to see if there is cable connection problems by pressing the connectors. - If you dare, you buy the sensor1 or sensor2 depending on code p1166 or p1167 and try to change it yourself. Be careful with the new sensor installation and do to use any anti-seize or wd40, it may ruin them - Or go to Dealer, go with your research on the price of the sensor. For dealer it may take 10 mins to change the sensor so be careful not to overpay the labor. Unless they put extra effort to determine the sensor is not the problem. - Always ask for defective part from the dealer. Some sneaky guys re-sale them to aftermarket when it may be okay in your car, and they change them anyway. - You can test the O2 sensor yourself on the bench or in the car but that require extra skills, time and tools. You may try this > Oxygen Sensor Information http://auto.howstuffworks.com/question257.htm