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1999 mazda 626 es V6 - Error codes P1131,p0133,p0040


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baddyfan
New User

Jul 19, 2010, 8:44 PM

Post #1 of 5 (7284 views)
1999 mazda 626 es V6 - Error codes P1131,p0133,p0040 Sign In

I have a 1999 Mazda 626 ES V6, auto trans, FWD, and 91K miles on it. I have the Check Engine light on since a few weeks.

I have the following error codes using OBDII tool
P0133 - Heated oxygen sensor H02S RF circuit malfunction

P1131 - Heated Oxygen sensor Bank1, sensor1 (H02S11)

P0040 - EGR system leak detected

The car starts, and runs fine, no strange noises, or stuttering. Recently, I had the fuel pump replaced. Gas lid is closed tightly.

I would appreciate if someone could help me get a rough estimate for repairs. I'm trying to make a decision whether to get the repairs done or get a replacement car. Thanks very much!


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 23, 2010, 10:05 AM

Post #2 of 5 (7275 views)
Re: 1999 mazda 626 es V6 - Error codes P1131,p0133,p0040 Sign In

Try spraying the outside of EGR area with carb cleaner and see if that changed idle. If no change then try cleaning the EGR. The pintle underside may not seal well?? If caked up sometimes they can be cleaned.

The EGR may be taxing O2 sensors and the O2 sensors are not the first problem but the result of another for now. Not sure why it said fault in circuit. Do see if it's at least plugged in properly and no burned wires,

T



baddyfan
New User

Jul 23, 2010, 8:10 PM

Post #3 of 5 (7264 views)
Re: 1999 mazda 626 es V6 - Error codes P1131,p0133,p0040 Sign In

Thanks for the reply, Tom! I appreciate it. I will give it a try.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 24, 2010, 3:05 AM

Post #4 of 5 (7261 views)
Re: 1999 mazda 626 es V6 - Error codes P1131,p0133,p0040 Sign In

Do give it a try. Know that code readings vary in quality and info collected. Take them with some common sense and don't just toss parts at everything it found some "error" with too quickly but think it thru.

When it can't communicate you will get a code that, that area has an issue. Can be a dumb as being unplugged. One minor fault that makes an engine run improperly can tax other items so you can get multiple codes and it's only one problem. Some when ignored can cause real problems with items that could be saved if timely.

Do post back with any findings or changes in codes,

T



baddyfan
New User

Aug 3, 2010, 8:56 PM

Post #5 of 5 (7209 views)
Re: 1999 mazda 626 es V6 - Error codes P1131,p0133,p0040 Sign In

Troubleshooting the problem seemed beyond by abilities. I had a repair shop look at it. They indicated that the EGR valve may need to replaced. Its diaphgram seemed to be faulty. They also said that cleaning will not resolve the issue. EGR valve is around $350 + $230 labor. I was also able to locate the part at a salvage yard for a fraction of the cost and found someone that is willing to install it for around $100 I am wondering if it is worth replacing it for a car with 91K miles. Any suggestions will be appreciated. Thanks again!






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