1998 Mitsubishi Eclipse GST, Code P1105

by Karen Wilkinson
(Sarasota, FL USA)

Back in November of last year a auto mechanic changed the O2 condensor on my car. They had some problems getting to the part and making the change and said they thought they got it tight. I have had problems since then. Now my car is missing badly and just last week an error code 1105, which is the fuel pressure selnoid. They said the O2 problem has nothing to do with this problem and refuse to check out the O2 condenser. I plan to have someone else look at it, but need to know if a bad exhaust system would cause the code 1105 or if the O2 condensor isn't in right would this cause the problem. I don't want to replace the fuel pressure solnoid if it could be one of these. I haven't had the exhaust change since purchasing and understand (looking at website info) that the manifold has something to do with the fuel pressure solnoid.

Thanks, Karen

Steve Says,

Hi Karen! Thanks for asking me your question. I'm not sure but I think you mean "02 Sensor". I have never heard of an 02 condenser. Either way, this sensor probably has nothing to do with the current code that you have because it is in a completely different system than the O2 sensors.

The code you are having is generated by the cars computer when it does not see the fuel pressure control solenoid valve working correctly. Most likely it is simply a problem with the solenoid and it needs replacing, but it could be other things like wiring or vacuum problems.

The exhaust manifold has nothing to do with the fuel pressure solenoid that I know of. However the intake manifold does because this is where the vacuum comes from that helps to operate the solenoid.

It is a good idea to have another shop check your car out just to be sure that this has nothing to do with the work that was previously done, but it sounds like it probably does not.

I hope this has helped. Good luck with your car problem.