Skip the auto shop - Our mechanics make house calls

Q: Trouble running when the engine warms up, dash lights on - 2007 Subaru B9 Tribeca

asked by on

The dashboard in my car has lately been showing the Check Engine Light illuminated along with the cruise control light and VDC light on. The car has no issues running when the engine is cold or a bit warmed up. However, after I have driven for a couple of hours, it has struggle developing speed. At that point, I have to get the engine cooled down maybe even several times during driving, depending on the distance. I went to the dealership but they requested me to leave the car there so that they could diagnose it. They read the codes and some of them include P0137, P0157, P0175 and P0172. Do you have any idea what might be wrong with my car?

A: The P0137/P0157 codes indicate the "re...

The P0137/P0157 codes indicate the "rear" (behind the catalytic converters) oxygen sensors are not functioning properly. In turn, they are signaling (incorrectly) for more fuel, which is causing the P0172/P0175 over-rich codes. This is clogging your converters, as well as causing poor performance. Both rear oxygen sensors should be replaced. A YourMechanic professional can come to your home or office to replace your vehicles oxygen sensors.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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

Q: Why is it still misfiring?

Hi there. Check the Exhaust Gas Recirculation valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the engine....

Q: Low oil

Well, I'm not sure if your motor is completely messed up, but running with low oil for such a long time is never a good thing. When the valve starts to chatter, they are not properly lubricated, and it's due...

Q: Engine and battery light on car lost power after driving for 5 minutes

Hi, thanks for writing in. This may be a result of a few different things such as a bad ground connection, a weak battery, a faulty alternator or potentially a failing voltage regulator. The harmonic balancer does not have any...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...