2012 CX-9 P2196 and P2198...Any ideas?

[mazcx92012]

Having issues with a 2012 mazda cx9 sport and. Geting a p2196 and p2198.

Previous owner had new fuel pump, hose, and tank done ( metal shavings in tank ). No codes would pop for them.

Day I revieved it had codes for cylinder 4 and 6, along with the two above codes. Replaced so far... all spark plugs and coil packs, rear top o2 sensor, and now all 6 lifters.

I don't wanna keep tossing o2 sensors as I don't believe that's the issue.

Any ideas? I'm thinking purge vapor canister

 

[200955]

You probably ARE running a rich fuel mixture and I am somewhat surprised that you don't have any accompanying codes like those from a MAP or MAF sensor. You may even have leaking/dripping faulty injectors because you specifically mention #4 and #6 cylinders. You should be able to see their operation on your scanner with live data being graphed. It's too bad you don't have a borescope to see if the tops of these pistons are wet with fuel after shutting down the engine. A purge vapor canister issues a separate code altogether but you can block the hose at the engine and it's inlet port and see if that's where the codes come from.

 

[mazcx92012]

Oops, I just read my op, says lifters when I replaced injectors. What what wet pistons mean?

 

[200955]

Oops, I just read my op, says lifters when I replaced injectors. What what wet pistons mean?

Wet pistons on top indicate that the injectors are not sealing closed when they should so you have "after drip" until the fuel pressure has dropped to nothing. This shows up as the carbon on top the cylinders looking wet with fuel.

 

[mazcx92012]

Wet pistons on top indicate that the injectors are not sealing closed when they should so you have "after drip" until the fuel pressure has dropped to nothing. This shows up as the carbon on top the cylinders looking wet with fuel.

There was some in cylinder 5 123 I didn't look. Currently driving it as it's Currently acting normal but has pending codes of rich bank 1.1 2.1

 

[200955]

Cylinder 5 probably just finished the intake stroke when you shut the engine down and fuel was found to be present. I would be interested to know the mileage on the vehicle as some components have a limited lifetime. It truly sound as if some component is on it's way out so that begs the question " do you have post catalytic sensors and did you change those". These items ultimately control the fuel/air mixture via the ECM. After clearing ALL codes, run the vehicle and note if the code is set during Open or Closed loop because O2 sensors only signal the ECM when their hot. Although it's usually the front sensors that tell the ECM the required fuel mixture the rear ones may come into play as well. For the time being, and if the issue is a sporadic, check all the sensors wires for damage and their respective connectors as well. I hope you find a chaffed wire or poor connection because repair by replacement can be very expensive.

 

[mazcx92012]

Cylinder 5 probably just finished the intake stroke when you shut the engine down and fuel was found to be present. I would be interested to know the mileage on the vehicle as some components have a limited lifetime.

It has 186,000 miles.