PO420 code cat low bank 1

The 420 is a cat efficiency code. It needs to be replaced.

The flashing light is a miss fire that needs to be repaired. Get the code for that. The miss fires will destroy the cat if it is not repaired and may have damaged the cat that is bad if the code was active in the past.

Roy

What kind of mileage do you have and what is the exact build date of the car? The build date should be on the labei on the jamb of the drivers door.I would contact a chrysler dealer with the vin also because the catalytic converter on that car is warranted for 8 years or 80,000 miles. You are right at the 8 year mark, I don't know about the miles. But you should be able to get the cat replaced under warranty. But as previosly stated if the engine is missing you will just ruin the new cat. The flashing mill indicates that the engine is running in such a fashion that it is going to do catylist damage.

When the check engine light flashes that is telling you that there is a catalyst damaging missfire occuring. Even if you don't feel it. But that 420 is pretty straight forward, replace that cat. But at that mileage your converter is under warranty and will be replaced free of charge at a chrylser dealer. They have to replace it under goverment regulations. No if there are no missfire codes and no miss can be felt then the failed cat can be the cause of the computer detecting o code. Get the cat replaced and if the engine still misses or the light flashes, then get that checked out right away.

The cat is still an issue and that will not go away. It will have to be replaced. Proving that the recall caused the failed cat will be most difficult. I am checking the recall to see what it was for.

It is not a defective pcm, updates have to do with programming issues.

Roy

June 2009
Dealer Service Instructions for:
Emissions Recall J18
Reprogram Powertrain Control Module

Models
2003-2004 (LH) Dodge Intrepid, Eagle Vision, Chrysler Concorde, LHS,
New Yorker and 300M

NOTE : This notification applies only to the above vehicles equipped with a 3.5L engine ("G, K, M or V" in the 8th VIN position).

IMPORTANT : Some of the involved vehicles may be in dealer used vehicle inventory. Dealers should complete this repair on these vehicles before retail delivery. Dealers should also perform this repair on vehicles in for service. Involved vehicles can be determined by using the VIP inquiry process.

Subject
The catalytic converters on about 77,700 of the above vehicles may become
damaged from continued operation in "limp-in" mode following a camshaft
position sensor fault.

Repair
The Powertrain Control Module (PCM) must be reprogrammed (flashed) to
prevent potential catalytic converter failure.

Parts Information

Due to the likelihood that the required labels are already in your parts inventory, no labels will be distributed initially. The following label may be ordered as needed.

Each vehicle requires application of the label shown.

Special Tools

The existing special tools shown may be required to perform this repair.

Completion Reporting and Reimbursement
Claims for vehicles that have been serviced must be submitted on the
DealerCONNECT Claim Entry Screen located on the Service tab. Claims
submitted will be used by Chrysler to record Customer Satisfaction Notification service completions and provide dealer payments.

Use one of the labor operation numbers and time allowances shown.
NOTE : See the Warranty Administration Manual, Recall Claim Processing Section, for complete claim processing instructions.

Dealer Notification

To view this notification on DealerCONNECT, select "Global Recall System" on the Service tab, then click on the description of this notification.

Owner Notification and Service Scheduling

All involved vehicle owners known to Chrysler are being notified of the service requirement by mail. They are requested to schedule appointments for this service with their dealers. A generic copy of the owner letter is included.

Enclosed with each owner letter is an Owner Notification postcard to allow owners to update our records if applicable.

Dealers are encouraged to consider alternative scheduling and servicing approaches for this notification. This repair does not require hoists or other full service facility special equipment and is a Chrysler Mobile Service approved repair.

Vehicle Lists, Global Recall System, VIP and Dealer Follow Up

All involved vehicles have been entered into the DealerCONNECT Global Recall System (GRS) and Vehicle Information Plus (VIP) for dealer inquiry as needed.
GRS provides involved dealers with an updated VIN list of their incomplete
vehicles. The owner's name, address and phone number are listed if known.
Completed vehicles are removed from GRS within several days of repair claim submission.

To use this system, click on the "Service" tab and then click on "Global Recall System." Your dealer's VIN list for each recall displayed can be sorted by: those vehicles that were unsold at recall launch, those with a phone number, city, zip code, or VIN sequence.
Dealers should perform this repair on all unsold vehicles before retail
delivery. Dealers should also use the VIN list to follow up with all owners to schedule appointments for this repair.

VIN lists may contain confidential, restricted owner name and address information that was obtained from the Department of Motor Vehicles of various states. Use of this information is permitted for this notification only and is strictly prohibited from all other use.

Additional Information

If you have any questions or need assistance in completing this action, please contact your Service and Parts District Manager.
Customer Services Field Operations
Chrysler Group LLC

Check your warranty as most cover 8 year 80k mileage. They wont do it again. One time only.

You can drive it for now but dont put of off too long

Roy

SYMPTOM
P0204-FUEL INJECTOR #4

TEST NOTE
This symptom is diagnosed using the test P0201-FUEL INJECTOR #1.

WHEN MONITORED
With battery voltage greater than 10 volts. Auto Shutdown Relay energized. Engine speed less than 3000 rpm.

SET CONDITION
No inductive spike is detected after injector turn off. One Trip Fault.

POSSIBLE CAUSES

Good trip equal to zero
(F42) ASD relay output circuit
Fuel injector
Injector control circuit open
Injector control circuit shorted to ground
PCM

Passenger side.

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