Q: P0171
I had a p0325 and p0171. I fixed the knock sensor but the lean bank 1 is killing me. I have replaced the MAF, PCV, FRONT O2 SENSOR, found one vac leak and replaced hose. STILL HAS P0171, What am I missing? HELP!!!!!!
My car has 188000 miles.
My car has an automatic transmission.
Recommended Services
| Check Engine Light is on Inspection | $94.99 - $114.99 | Get a Quote |
The code P0171 is due to the left bank of the engine running lean and has reached the rich limit for the ECM. Try to have the injectors cleaned and run only high quality fuel that has cleaning additives. This should clean out the injectors and combustion chambers and clear the code. If you need help having this done, a certified technician from YourMechanic can inspect the code in person to determine the appropriate actions.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
Get an instant quote for your car
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
What others are asking
What does the powertrain malfunction/reduced power (RTT) Warning Light mean?
The Powertrain malfunction/reduced power is a warning that is illuminated when the vehicle is experiencing a condition - that if driven can cause damage to the engine, transmission or drivetrain. The warning is to let you know to decrease the...
Oil light flickers.
Your engine knock may be due to worn rod or crank bearings. You should have the oil pressure checked to see if it is within specifications. With over 220k miles you may need to have the bearings and/or the oil...
My car just cut off while driving and won't start again
Hello there, a few different faults can cause your 2005 Nissan to shut off while driving. A failing fuel pump is one of the faults that can cause this. Other likely problems would be the battery (https://www.yourmechanic.com/services/battery-replacement), alternator (https://www.yourmechanic.com/services/alternator-replacement), battery...
car cutting out in low gears on stopping, traffic lights and junctions
Hello. This is often times a sign of a failing mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement). As you may know, this is a unit that monitors the air flow into the intake as it is mixed with the fuel prior to...
Slip Indicator Light Wont Turn Off
This is likely a result of hitting the median. There are wheel speed sensors (https://www.yourmechanic.com/services/wheel-speed-sensor-replacement) on each of your wheels that monitor wheel speed. This is then relayed to the ECU which engages the slip indicator light and system. When...
Heater only works on high
It sounds like you may have a faulty blower motor potentially drawing too much power from the resistor causing it to burn itself up. As you know, the individual blower motor resistor (https://www.yourmechanic.com/services/heater-blower-motor-resistor-replacement) inside the pack are usually wire wound...
My 98 accord keeps giving me system too rich , i changed the o2 sensors both of them , the map sensor, the distributer , spark plu
P0172 (https://www.yourmechanic.com/article/p0172-obd-ii-trouble-code-system-too-rich-bank-1-by-blake-griffin) means too much fuel or, conversely, too little air, is being supplied and thus the air fuel ratio is sub-optimal. Other causes of this code setting, that are not reflected in your list, include a dirty mass air...
What is the cost to replace oxygen sensors P0139, PO159
Hi there. In general, there are two O2 sensors on your Toyota, an upstream sensor (located near the exhaust manifold) and downstream (located after the catalytic converter). Based on the error codes you listed however, it's not 100% certain that...
I have a 2003 Silverado 4.3 v6.. Its gushing oil from around the oil filter. I've used 2 different brand filters and checked the t
You need to make sure you are using the correct filter and remove filter and make sure the old gasket from the old filter is not still stuck to the filter sealing surface. This is most common reason for filter...
Related articles
P0302 OBD-II Trouble Code: Cylinder 2 Misfire Detected
P0302 code definition Cylinder 2 misfire detected What the P0302 code means Most vehicles have either 4 or 6 cylinders. Each cylinder...
P2005 OBD-II Trouble Code: Intake Manifold Runner Control Stuck Open Bank 2
P2005 P2005 trouble code definition P2005 is a general OBD2 trouble code that indicates a malfunction with the intake manifold runner control circuit. This code is similar to P2006, P2007, P2008, P2009, P2010, P2013 and P2015. What the P2005 code...
P0481 OBD-II Trouble Code: Cooling Fan 2 Control Circuit Malfunction
P0481 means a problem with the control circuit for cooling fan 2. Some causes are faulty cooling fan or damage to the wire connecting the cooling fan.
Browse other content
Maintenance
Cities