Question about 1999 Mercury Cougar

2 Answers

1999 cougar diagnostic code p0430 and p0420

I have a 1999 cougar 2.5 litre I have 2 codes po430 and p0420 the car is using alot of fuel, what will cause this. Thank you.
Willie

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Mercury Master
  • 6,674 Answers

Failed or faulty oxygen sensor, or faulty catalytic converter. It's actually the oxygen sensor reading that the catalytic converter is not functioning properly & needs relacement. That's provided the oxygen sensor is not faulty, which personally, I'd go for that first.
Both would explain excessive fuel usage.

Posted on Jan 25, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Where is the fuel setting device located

Posted on Feb 01, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: 1999 cougar two diagnostic codes p0430 and po420

if you go to your public library they can give you the car repair manual to use and it will have to diagnostic codes listed, if that is any help to you, but i need to know what size tires are on that car. i just bought one and it needs tires badly, and i am not sure that the tires on it are right.

Posted on Jan 24, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Engine Code PO430


P0430 Ford - Catalyst System Efficiency Below Threshold Bank 2

Possible causes - Three way catalyst converter Bank 2
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM) Tech notes As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.

Mar 14, 2015 | 2010 Ford F-150

1 Answer

1999 cadillac escalade turns over but does not start.


Hi there,here's a link to the P0430 code.Here's the link to the P0137 code.Here's the last code P0160.Look's like Oxygen sensors.

Mar 24, 2013 | Cars & Trucks

1 Answer

I have a 2004 cadillac cts 3.6 v6 I have a strong smell inside the cabin the smell is like an exaust smell but at the same time sweet. I do have check engine light with obd code p0430 only. No other code...


You have a rich fuel mixture that ruined the exhaust converter

Google the PO430 code

The smell may be a coolant leak on the exhaust

Two problems

Mar 05, 2013 | Cars & Trucks

1 Answer

Code po430 came up


P0430 FORD - Catalyst System Efficiency Below Threshold Bank 2

Possible causes- Three way catalyst converter Bank 2 worn out
- Exhaust tube leaks
- Intake vacuum leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
-
-

Oct 08, 2012 | 1997 Ford Taurus

2 Answers

My 1999 Chev Tahoe will not start - Has codes p0430 and p0420


Hi Charlie,
Diagnostic Test Codes (DTCs) P0420 and P0430 ar "Catalyst Efficiency" codes. These simply mean that the catalytic converters in your vehicle are not performing the way they should be. To fix these codes, you will most likely have to replace the converters. However, these codes do NOT indicate why your engine wil not start. There are many things that can cause an engine to not start. Many of which may or may not set fault codes. You need to determine if the engine is getting fuel and ignition first then go from there.

Dec 17, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

What do these codes mean ? po430 po420 po306 for mercury cougar 1999


P0430 code is(catalyst efficiency below threshold on bank 2)
P0420 code is((catalyst efficiency below threshold on bank 1)
P0306 code is(cylinder 6 misfire detected)

Dec 13, 2011 | 1999 Mercury Cougar

1 Answer

98 gmc sierra 1500 5.7 po430 code


Below is a general description of the problem. Check the following possibilities and we can go from there.


DTC

P0430 - Catalyst System Efficiency Below Threshold (Bank 2)

Description
Indicates Bank 2 catalyst system efficiency is below the acceptable threshold.

Possible Causes
Use of leaded fuel
Damaged Oxygen Sensors
Malfunctioning ECT
High fuel pressure
Damaged exhaust manifold
Damaged catalytic converter
Oil contamination
Cylinder misfiring
Downstream Oxygen sensor wires improperly connected
Damaged exhaust system pipe
Damaged muffler /tailpipe assembly
******** spark timing

Dec 11, 2011 | 1999 GMC Sierra

1 Answer

97 Mercury cougar xr7 v6. po443, po430, po171, po174,


Sounds like you have low fuel supply or a leak in intake system causing lean codes, check fuek pressure and volume first. Cat converter effeciancy could be caused by the lean codes, purge system sounds like solenoid failure, check for high resistance accross purge vent solenoid.

Mar 08, 2010 | 1997 Mercury Cougar XR7

1 Answer

1999 cougar two diagnostic codes p0430 and po420


if you go to your public library they can give you the car repair manual to use and it will have to diagnostic codes listed, if that is any help to you, but i need to know what size tires are on that car. i just bought one and it needs tires badly, and i am not sure that the tires on it are right.

Jan 21, 2009 | 1999 Mercury Cougar

Not finding what you are looking for?
1999 Mercury Cougar Logo

Related Topics:

1,815 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts

yadayada
yadayada

Level 3 Expert

60667 Answers

Fordexpert

Level 3 Expert

5331 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21936 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...