I have a Volvo S60 (turbo) from 2005. She almost all the time had an engine light on (I bought it this way), but was told it might be just a sensor. Mechanics would reset it when I had to get it inspected.
- Took the car to the mechanic to get it checked for maintenance. He changed the air filter and added some oil. He also found some codes such as 140C, 140D, 120D, and 400C. Told me there might be something about the catalytic converters but that is too soon to tell.
- A few days later the maintenance message came to my dashboard. The mechanic changed the oil, oil filter.
- Next day I drove the car many miles. Then the day after the dashboard said “reduced engine performance” and stopped running (in idle).
- He told me the throttle body needs to be replaced. We replaced it and was told to bring it back if the engine light comes back. It did.
- Took it to AutoZone to read the engine light and they said it is a code for the catalytic converter. I just needed to double-check.
- Went back to my mechanic and he told me to buy this special additive to add to the fuel tank to “clean” the converters. He took out the engine light to see if it comes back after I drive it with this additive inside the fuel tank.
- Engine light came back on and the codes were air mass flow and catalytic converter. This back and forth happened twice as he said that it takes a few rounds to diagnose a problem on the Volvo.
- Today he told me to change the air mass flow.
I am a female so my car mechanics knowledge is limited, hence, that’s why I am here.
Is there a connection between air mass flow and a catalytic converter? What about the throttle body in connection to the catalytic converter? What other options do I have to make sure it is not the catalytic converter? What other tests can he do on her to rule out the converter? Has this happened to your Volvo? Please share.
Thanks for your help and advice.