Question about 2005 Dodge Caravan

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What could be the reason that I keep getting a Cat Code CEL?

This 3.8 V6 doesn't have an EGR setup and after replacing the upstream O2 sensor the CEL went out for 5 cycles and then came back on an gave the Cat code. What can I do to make sure that I need a new very pricey cat. or don't need a new cat.?

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Po 420 cathalytic ineficient i say on you tube a guy you clean is cathalytic convertor with seafoam i try to find it for you

Posted on Apr 10, 2015

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Take it to a dealer and have the cat checked

Posted on Apr 10, 2015

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Hi, I have a 98 Honda Accord Ex V6 that showed the P0420 code and I was told that the catalytic converter needs to be replaced. So I replaced it and the check engine light came on with the P0401 code. I...


The error code p0420 does not rise only due to faulty catalytic converter but may also rise due to one of following reason:

1. Faulty rear O2 sensor

2. Damaged O2 sensor wiring

3. Exhaust leak

The error code p0401 indicates faulty Engine Gas Recirculation (EGR) valve. The remedy to the problem is:

a. Replace EGR valve

b. Repair damaged wiring of EGR valve

c. Clean the EGR valve tubing

Jun 27, 2013 | Cars & Trucks

1 Answer

The service engine light came on and the code a service station gave me was a P1168 code. Closed loop fault detected (Bank 2). I looked up some info online and found out it may be a oxygen sensor, which...


Closed loop is defined based off throttle position and the runs off of the O2 sensors on the exhaust manifolds.
The post-cat O2 sensors are strictly for emission purposes.
It sounds like you need to replace both of your O2 sensors UPSTREAM - on the headers/exhaust manifolds.
Resetting the ECU will not get rid of the problem and the CEL will return if the sensors do need to be replaced.

Jul 11, 2011 | Nissan Maxima Cars & Trucks

2 Answers

I need to know how to locate the upstream and downstream o2 sensors on my 1996 ford explorer xlt 4x4 4.0 liter v6 automatic w/ a/c


Did you get them codes read? if so whoever did it should be able to locat them ,,,,,,,,,if not Auto Zone or any parts store can show you on computor in store and run a code scan for free

Mar 16, 2011 | Ford EXP Cars & Trucks

1 Answer

03 santa fe code p0421 for warm up catalyst below bank 1is it converter sensors whats bank 1 converter location compared to bank 2 is there 2 banks or converters would it be upstream or downstream if it...


If the engine is a V6 (2.7 or 3.5 lit), bank 1 is next to the firewall (right hand) when facing the back of the engine.
If the engine is a 4 cly (I4), there is only one bank and is designated Bank 1 (exhaust manifold).

The catalyst to which the code refers is the UPSTREAM, and there is only ONE upstream cat for any bank.

Clue: Two upstream O2 sensor and two downstream O2 sensors - one before the CAT and one after the CAT. the downstream O2 sensors are identical to their upstream sisters. The only reason for the DOWNstream sensor is to monitor the CAT efficiency (threshold).

The catalyst on either bank is essentially the exhaust manifold which houses the CAT... it is the only CAT to which the code P0421 applies.

Hope that helped

Feb 06, 2011 | Hyundai Santa Fe Cars & Trucks

1 Answer

Replacing upstream O2 sensors on 2002 chevy silverado 1500


follow the pipes from the cat forward, you shld be able to find them. from the cat down or back, would be your rear sensors.

Aug 26, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

Replace oxygen sensors


these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

May 15, 2009 | 1998 Plymouth Grand Voyager

1 Answer

When Accelorating the engine chugs and acts as if it's starving


ASE mechanic here:
Try running engine with o2 sensors removed. if runs different suspect cats, and or install vacuum pump on egr, if egr is ok then motor rpm shall decrease with more vacuum if egr is not working there would be no affect on engine rpm, Keep me posted

Jan 26, 2009 | 1989 Ford F 150

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