Last post on Dec 25, 2010 at 9:12 PM
You are in the Mazda MPV
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Mazda MPV, Van
#61 of 68 H02S Heater Control Location
Feb 17, 2009 (2:37 pm)
I own a 2000 Mazda MPV with 57,000K on it, recently my check engine light came on so I connected the OBD || tester and got an P0031 DTC, Result; H02S Heater Control Circuit Low Bank 1 Sensor 1. Question, Can some please tell me where is this sensor located? It's telling me is on the right side but I don't really know the exact location.
Feb 19, 2009 (9:11 pm)
2002 MPV w/ 119K miles. Owner asked if I would take a look at it. His complaint was that the engine would start stumbling badly and CEL. I drove it, and it drove just fine, but told him I would see what I could find.
The plugs were original and pretty burned up, so that was the first thing I changed. Cleared the codes, started right up, ran great for a few minutes, then dropped a cylinder. Couple of minutes later, dropped another. (4 and 6). I have rechecked the assembly (who in the sam hill came up with having to pull the top half of the intake to change the rear plugs???!!!) and everything is connected, nothing leaking, and the only code setting is P0300. I am about ready to send him to a dealer or independent with better diagnostic software, but thought I would throw this one out there to see if you guys have seen a trend.
Most of my tech support is over in the Blazer forums, but figured I would try to look at this since it is a Ford engine.
Thanks for any help you can offer.
#64 of 68 Re: P0300 Question [budmantom]
Feb 19, 2009 (10:51 pm)
Well, I am an idiot. Fortunately, somebody (forget the name, but you know who you are and if we ever meet, I owe you a beer) documented this same repair with very good photos. I went through the whole process for the ump-teenth time, and everything was as it should be.
That is, until I looked at the routing of the front bank coil harness. It doesn't do a sequential route like the rear bank. It comes across the valve cover and in between 5 and 6. Who knows why, but it does, and I got 4 and 6 swapped.
Anyway, while fixing that, I found another problem and fixed it. The retention tab on the #5 coil was broken, and the connector was loose on the coil. Couple of ty-wraps later and it is snug as a bug. And the engine runs sweet and sets no codes.
But I am not doing another one of these beasties if I can help it. Pulling the plenum just to get to the plugs is just wrong.
#65 of 68 Can't find reader plug...:P
Sep 03, 2009 (9:08 pm)
Anyone know where to find the plugin for the code reader on a 1991 MPV? I've looked both under the dash and all under the hood and can't seem to find it.
#66 of 68 mpv mini van what a joke 2001
Aug 24, 2010 (7:52 am)
i took the van in to the shop because bad performance when cold, after 10 miles it runs like a champ, if you stop and turn it off for 30min to an hour it runs like crap, then after app 10 miles runs like a champ, we have replaced the bad intake gaskets upper and lower, still no response, replaced coil, no response, took the intakes back off for soaking with chemical, then put it back together again, still no response, still missing, changed plugs, changed wires, still no response, now it shows low compression on #1 back next to fire wall, app 90 lbs, so i would assume we need to a 1000 dollar valve job, does anyone know what the hell ford/mazda has done to these engines, i know they say the intake gaskets were faulty from factory, but just issued new ones to replace them with it, seems a lot of people have the same problem, i would say to all people to have compression test done on the engine before you spend 2-3000 dollars on these vehicles. if anyone can tell me why this happened and how i would like to know. thanks
#67 of 68 Re: mpv mini van what a joke 2001 [mpvhater]
Aug 25, 2010 (12:13 am)
Is it a diesel engine
#68 of 68 Multipe Codes - Need Help
Dec 25, 2010 (9:12 pm)
I have the following codes showing:
P0300 - random multi misfire detected
P2404 - evaporative system leak detection
P0113 - intake air temp sensor 1/ circuit high
P0421 - warm up catalyst efficiency below threshold bank 1
This happens only when the weather is below freezing. Engine sluggish / hesitates.
This completely resolves itself when weather warms up.
What could be going wrong?
My theory is - the O2 sensors front (1) and back (4) are fouled up for some reason. But I could be wrong.
Anyone has clues about the root cause?