2004 chrysler pacifica check engine light code p0442,0456 where do I start was in shop for a week still not fixed.

Weak battery- Low voltage while cranking
- Faulty Engine Control Module (ECM) relay
- Blown ECM fuse
- Faulty ECM
- ECM harness is open or shorted
- ECM circuit poor electrical connection

This is the pressure light I think. Have that looked into RIGHT AWAY before you burn out the bearings in the engine.

bank 1 cyl 1 if 02 sensor fault is present replace both sensors with oe part as sometimes after market sensors may not be compatible.both sensors because 1 will be week and will cause the same failure later provided the cat is ok and does not store a cat efficiency fault.

Look closely at #6, probably bad connector or wiring to coil. Get it somewhere else a 'new engine' sounds like a real bad outcome under the circumstances.

Re-check the engine timing.

my car have that same problem. I went to my shop and was told that there is a kit you can get to fix it. but the kit will run you about 150.00. vic 500.00. Look into it. the leak might come from back of the engin cover.

Symptoms look like a cam or crank sensor failure. Check the connections to these sensors and make sure that they are clean and on securely. If it is just a bad connection then the problem should be resolved. If however it is due to thermally induced cut out the chances are that when the engine has properly cooled right down the car will restart. If it does start it will probably shut down again within 15 minutes once the engine is hot and not restart until cold again. If you are able take the car to Autozone to have the error codes read from the on board diagnostics. If not replace both sensor units and this should cure the problem straight away. If you have a Check engine light lit then this can be cleared by disconnecting the negative battery terminal for five minutes

that would be your HO2 sensor. It's located in the left hand exhaust manifold closer to the top of the engine. It usually takes a special socket to remove one. If you have any doubt, take it to a shop and have them replace it for you. This sensor effects fuel and driveability, don't go to long without fixing it as it may cause damage to your catalytic convertors.

If the light isn't flashing, it is safe to drive. If it is flashing, then catalytic converter damage can result. Have a parts store check the codes for you and come back and post the code.

engine light on , DTC'S - diagnostic trouble codes stored in the PCM - engine computer . Given all the electronics an control modules on your vehicle ,your best bet mite be to take it to a qualified repair shop.