Getting error codes P0599 and P0171. Ive cleaned the O2 ...

Q: Getting error codes P0599 and P0171. Ive cleaned the O2 sensors but have no idea where to go from here.

asked by on October 11, 2016

^This

My car has 77000 miles.
My car has an automatic transmission.

Hello. Code P0599 is the code for an issue with the thermostat heater control circuit, while P0171 is for a lean condition on bank 1. P0599 is set when the computer detects that there is an issue with the electronically regulated thermostat’s circuit. It may be possible that the electronic thermostat has failed and needs to be replaced. P0599 is set when the computer detects a lean condition from the engine. A lean condition can be caused by many things. A few common causes are a faulty fuel pump, fuel injectors, or oxygen sensor. I would start by taking care of the thermostat issue, as thermostat issues can sometimes lead to overheating, and then move to the oxygen sensor. If the oxygen sensor has been cleaned, then it may be possible that it is faulty and needs to be replaced, or that the issue is elsewhere. If you would like, a certified technician from YourMechanic can perform an Check Engine Light inspection, and make necessary repairs.

Was this answer helpful?
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

Get a quote

What others are asking

How do I program the HomeLink garage door opener for non-rolling code garage doors?

Garage doors that were made before 1996 are referred to as non-rolling code. Here is how you program them with your HomeLink garage door system. Insert your key into the ignition, and turn the ignition switch to ON/RUN. Locate...

How do I deprogram the memory feature?

The memory feature on your truck move the seats and mirrors to your desired settings. If you ever need to change where the settings are placed, you can deprogram the memory feature. To deprogram the memory feature. Hold down...

Service ESC

The Electronic Stability Control (ESC) system is your car's traction control system. The traction control system monitors the steering stability of the vehicle and engages when loss of traction has been detected. This is done by the use of electronic...

Related articles

P0203 OBD-II Trouble Code: Injector Circuit Malfunction - Cylinder 3
P0203 code definition P0203 is a general OBD2 code that points to a fault in the injector circuit. Note: This...
P2265 OBD-II Trouble Code: Water in Fuel Sensor Circuit Range/Performance
P2265 P2265 code definition The P2265 diagnostic trouble code is an indication that there is a range/performance issue with the water in fuel sensor circuit. Related Trouble Codes: P2264 OBD-II Trouble Code: Water in Fuel Sensor Circuit P2266 OBD-II...
P2101 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit Range/Performance
P2101 trouble code definition Throttle Actuator Control Motor Circuit Range/Performance What the P2101 code means P2101 is an OBD-II generic code for...