Last post on Oct 26, 2013 at 11:52 AM
You are in the Chrysler/Plymouth Voyager, Dodge Caravan
What is this discussion about?
Chrysler Voyager, Dodge Caravan, Dodge Grand Caravan, Chrysler Grand Voyager, Van
#2348 of 2391 Re: Solving problem P0420 [docbunner]
Apr 13, 2009 (9:08 am)
Catalyst System Efficiency Below Threshold (Bank 1)
What does that mean?
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
You will likely not notice any drivability problems, although there may be symptoms.
A code P0420 may mean that one or more of the following has happened:
Leaded fuel was used where unleaded was called for
An oxygen sensor is not reading (functioning) properly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Some suggested steps for troubleshooting a P0420 code include:
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
#2349 of 2391 Re: Re 96 Caravan that loses power [okamt]
Apr 26, 2009 (11:46 pm)
I had a very similar problem with my '96 Dodge Caravan 3.3 liter. About 8 miles on the highway at 65 mph and it would lose power, if I waited an hour the problem was gone. I found that if I drove under 55 mph I would get no failure at least for the short distance I was traveling to work. MIL codes were 11, 22, 7,27,43 (misfire),61,55...so there were some strange codes but the misfire stood out. I took it to two different mechanics...one said he wasn't sure, the other replaced the coil which did no fix the problem. Per previous comments this thread I replaced the crank position sensor, but that did not correct problem. I noticed in the repair manual that there is a also camshaft position sensor so I replaced that since function appeared similar to crank sensor. That fixed the problem. Fyi and thanks for all input.
#2350 of 2391 State Inspection:Aborted
May 28, 2009 (10:44 am)
My 1996 Dodge Caravan can not be inspected because the "on-board computer
is not compatable with the state's inspection computers". When you run the
reguired tests, the process quits and machine reads: TEST ABORTED. Do I need
a whole, new, more modern on-board computer or is this a fuse/fuse box fix that I should for?
Jun 28, 2009 (1:49 am)
hi...I have an 04 Voyager..can anyone tell me if there is any difference in the suspension between this model and the previous model...I have access to aftermarket sway bars from the previous model and would like to fit them to my 04...thanks
#2352 of 2391 whining Grand Caravan
Jul 08, 2009 (12:17 pm)
My 2007 3.3 ltr Grand Caravan with 42,000KM, has developed a whine that is not really loud but gets louder when hot & is quite noticeable when you turn on the A/C. The pitch of the whine changes as you rev up the engine. If on a steep hill (down) & put it in low gear to ease down slowly you can hear it quite loud. When I first complained, Dealer replaced the Alternator & idle saying the bearings were not good. Next they changed the A/C pump when I pointed out that it got louder when that clicked on and off. No change after either "fix". They say it really isn't that loud and is a normal thing. They contacted Chrysler and were unable to find any help there - it really isn't a problem (unless you are the one driving it!)... Today they took it in and to make me happy they took the trans. pan off, checked the oil & all components & found it was all good. No problems. No fix. Noise still there. Suggestions?
#2353 of 2391 P0442 & P0455 EVAP Ctrl System Leak
Jul 08, 2009 (10:51 pm)
My 2003 Dodge Grand Caravan just failed smog due to the EVAP leaks. Can you tell us what needs to replace? Is it a vacuum hose or is it a major fix.
Thanks for your time.
#2354 of 2391 Sliding door interior swtiches
Sep 02, 2009 (9:55 am)
I have a 2001 grand caravan and my interior sliding door buttons do not work. My keypad button does open the door. any ideas.
#2355 of 2391 Re: Sliding door interior swtiches [scarter711]
Sep 02, 2009 (11:08 am)
check your console on the roof. You have an on and off switch that is for turning the controls off to the sliding door as a child proof. I have myself turned this off and forgot I did so. When I took it in to get it checked out the service guy told me to chec k this switch. Hope this helps.
Sep 02, 2009 (1:00 pm)
Have the above code on my 2001 Dodge Grande Caravan. Looking it up it says: leak detection pump switch or mechanical fault. What is this? Where is this pump located? Thanks for any help!
#2357 of 2391 Re: P0442 & P0455 EVAP Ctrl System Leak [jtap0916]
Sep 10, 2009 (9:50 pm)
I have a 2002 Dodge Caravan which had a code 455 and 442. The following is a description of this van. The problem was caused by a 12 inch hose located under the van on the drivers side close to and in front of the liquid/vapor separator canisters. The 5/8 inch ID hose was connected between the front (engine side) of the LDP vent valve and the leak detection pump. Oil from the engine had leaked onto the end of hose connected to the pump. The plastic clamp was broken and the hose had swollen until it was very loose. Replacing the hose and clamps fixed the problem. The LDP vent valve is connected to the largest liquid/vapor canister by a 2 inch long hose. You may need to buy the hose from the Chrysler since it is a shaped hose. Any broken or missing clamps should be replaced with the band type sold by auto parts stores. Any other hose which is split should be replaced. I found one small L shaped hose with different IDs on each end connected to the small liquid/vapor canister which had a small split which I replaced with a hose I got from Chrysler for $5.