Codes P0340 and P0345

BENDER485

MEMBER
2004 MAZDA 6
6 CYL
FWD
AUTOMATIC
110,000 MILES

I have 2004 Mazda 6 3.0 L. I have an intermittent jumping in the trans or engine. Check engine light came on and coded P0340 Cam Sensor 2. I replaced both Cam sensors 1 and 2 and have the same problem resulting. Drove it around the block and check light and traction control light were lit and the same codes. It seems to happen more often when it is damp or humid out but really does not matter on the weather. All these problems arose after I had my spark plugs changed. Check engine light came on and said cylinder 2 misfire. Took back to dealership and they said it might be coilpack, so I replaced that then the send my car coded for a throttle body. I had them clear the throttle body code and never came on since but I have been having this cam sensor issue and bucking of the car. My car ran perfectly fine until the plugs were changed. Any suggestions?

Monday, June 8th, 2009 AT 7:44 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

The two codes indicate a correlation issue between the sensors. There are several things that can cause this to happen. Most commonly, it is the result of a failing sensor. However, you replaced them.

The second is a wiring issue between the sensors and the powertrain control module (PCM).

The third is a stretched or worn timing chain.

Since the sensors are new and the vehicle really doesn't have enough miles on it to consider a timing chain-related issue, and it seems worse when it rains or is damp, I suspect there is a wiring or connector issue.

Inspect the connectors at the sensors and make sure they are tight, clean, and free of corrosion. If they appear to be in good condition, follow the diagnostics below to identify the root cause of the issue.

I hope this helps. Let me know if you have other questions.

Take care,

Joe

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