Skip the auto shop - Our mechanics make house calls

Q: Getting multiple codes

asked by on

I am getting codes P1507, P0135, P0155.

Hello. When you get these codes together it is typically the result of a vacuum leak. If there is too much air entering the engine, your truck will have idling problems and this will cause issues with the oxygen sensor readings. I would typically start by checking all of the vacuum hoses and do a smoke test on the engine to see if any leaks are present. If there are not any leaks, then I would use a scan tool to monitor the sensor inputs to see if the air volume sensor is reading correctly. This would help to narrow down the problem. If you were going to have a shop diagnose this, consider YourMechanic, as a certified mechanic can come to your office to perform these tests and repair the vehicle.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Periodically vehicle runs rough at idle.

Hi there. Most of the codes that are coming on are for a misfire on cylinder number 3. Check the spark plug and wire on cylinder 3 and see if you are getting a good spark. Then check the fuel...

Q: Car ran hot and now it will crank, but will not start.

Hi there. From the description you have provided, your vehicle will crank, but will not start, needs to be properly diagnosed. Replacing parts without diagnosing, can be costly and time consuming. The fact you got the engine to start after...

Q: (08 f150 4.6L) Truck is cutting off when making a complete stop at red light or stop sign.

Check the Idle Air Control (IAC) valve and see if its dirty or not functioning correctly. I recommend removing the IAC and cleaning it out. If the valve was sticking before, the computer could have caught it and adjusted the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.