Q: Check engine light on, codes for air intake temp sensor, catalytic converter, and knock sensor. Car is bucking when going uphill.

asked by on

Recently purchased the car. Check engine light would come and go for a few days but then stayed on steady. Scan shows for catalytic converter, knock sensor, and air intake temperature sensor. Car drives ok but has been making a chirping noise and bucks when going uphill. So far I have replaced the air intake sensor, new air filter, and used a catalytic converter cleaner.

My car has 211000 miles.
My car has an automatic transmission.

If the check engine light is presently on your most efficient option would be to request a check engine light diagnostic. The mechanic will resolve all codes and then re-evaluate your situation, that is determine if the engine still misses under load even after all codes have been investigated and resolved. Note that diagnostic trouble codes only provide clues as to the general area of the problem. Consequently, unless you actually tested the air temperature sensor and pinpointed a failure, the sensor might have been perfectly good. For example, you can obtain the identical fault code for the sensor just by disconnecting the wire to a perfectly good sensor. Chirping noises are often serpentine belt related, if not the belt then an issue with the circuit of rotating components. If the check engine light is not on, but you just want the bucking diagnosed and fixed, as well as the noise issue, please instead schedule service via YourMechanic’s engine loss of power diagnostic page. With regard to either diagnostic, if you request service the certified mechanic will get your issues resolved for you, right at your location. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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
  1. Home
  2. Questions
  3. Check engine light on, codes for air intake temp sensor, catalytic converter, and knock sensor. Car is bucking when going uphill.

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: My car is only yielding 11km/liter - what should I do?

Hello. A 2016 Impreza 2.0 should yield 28 mpg city 37 mpg highway. If it is only yielding 11 KM/L at 120 KM/PH then there is likely an issue with the vehicle, as it should be yielding close to 15...

Q: 2010 Subaru Forester power steering does not work, battery light is on, smell of rubber from engine compartment

It does indeed sound like your drive belt is broken. Your vehicle has two belts: one for the A/C and another for the power steering and alternator. Obviously, if the latter breaks, you no longer have power steering and your...

Q: Q: Head gaskets leaking

These engines, if turbocharged, can have various problems; the system over-boosted and blew the head gaskets, or the engine overheated and warped the heads, causing the gaskets to leak. Either way, this may have damaged the heads, so the repair...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.