Top 20 2003 Mazda MPV Questions & Answers

Hi, as you look at the belt it will rotate to the front of the car. hope this was some help all the best.

Your catalytic converter may be clogged

it is a regular fault generally it is the Heated oxygen sensor (HO2S) in the exhaust manifold before the cat converter other cause can include engine mechanical fault ( unlikely)---wiring---ignition / fuel system--injectors ---ECT/MAF sensor---ECM a vacuum problem will affect both banks as will a PCV valve The HO2S reads the exhaust gas composition and reports to the ECM which then adjusts the air /fuel ration accordingly to keep it within set parameters The code says bank 2 sensor 1 which is the HO2S sensor so replace it and then have the codes read again

It sounds like the trans itself. if you would like to take it to a trans specialist to fix the 1 problem u have u can. Judging by the yr/ make & model I would advise you to to replace the trans assy complete. the rest of the gears & plates in the trans are not in top shape either.

-Both switches (Driver side and passage side) do the same thing ?-If so then there is a bad connector at the motor. Power line or ground. -But can't open only on 1 switch. Then that switch is worn out. Good luck Mai

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You need to have the Body Control module (BCM) tested for proper function.

all these codes can be problem except 306 misfire start with 103 113 and 335 If you need further help, reach me via phone at https://www.6ya.com/expert/james_9c1b039055413ffa

Start with the fuses or relay

Tcs is not related to the engine. Please get a scan and post the trouble codes here.

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bank 1 is on the left side of the engine and sensor 2 is just past the converter

Scanning tells a lot. But if your not getting an engine light. Check vacuum lines first. But if you turn the key on and don't see the light. it blew or someone took it out. Then yes, start with having the codes read.

its a known problem for the rear heater the following link shows problem and how it should be fixed {for service shop mechanics } Tech Tip Mazda Leak From Rear Heater Pipe ---you can buy replacement parts yourself and change out the lines the link showes what and where the problem is

code p 0660 refers to intake manifold tuning valve ,bank 1--circuit open===causes --wiring--intake manifold tuning valve The fix will be a replace valve the problem is to find it's location but if you talk with Mazda spares or service department , they should show you where it is located a workshop manual would be a help as well

I believe its located just below the oil filter.

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code p 0421 refers to warm up cat converter bank 1--efficiency below threshold ===causes ---cat converter---wiring---HO2S 2 ( heated oxygen sensor) code p 0431 refers to warm up cat conveter bank 2--efficiency below threshold === causes cat converter --- wiring---HO2S 2 as the same HO2S appears in the cause of the fault I would be inclined to change it first the HO2sS sensor is the one in the exhaust manifold or before the cat converter and 2 is in the front bank of a V engine use the special socket when removing/ replacing these sensors as an incorrect tool is the main reason for wire failures on the sensors

Doesn't sound good Al. Check your engine oil level and make sure it is ok. Could have had a rod bearing seize and fubar the whole engine. Oil puddle under van? Squeaking related but without hearing noise is a tough one. I have heard engines that are on the verge of seizing up to squeak as the bearings seize up and then finally just freeze and seize together. On a lighter note the vans are also prone to having the PCV hose at the back of the intake manifold fall apart and deteriorate. Odd noises have emanated from this sometimes very large vacuum leak that is created. Squeaks, Whistles, etc. If oil was in the hose at time of rupture then oil would have dumped onto the rear exhaust manifold that may have created this smoke from under the hood. You can find more information on this hose at mpvclub. If the engine still cranks over normally but will not start or starts and dies then can rule out the engine damage. The squeaks from this problem are a death call and engine will just not turn over at all.

Connector scan tool and confirm that the light is not working. The scan tool in its normal process goes through a start up process that lights ck engine indicator. Most auto parts store will do a complementery check when they are not busy.