Big Al

Why would the MAF sensor fail about every six months? What could cause this?
I've checked the wiring, connectors and everything else I can think of. It
does not look oily or dirty. On number three and it's out after six months.
Number two lasted two months, thought it was just a bad one. When number one
first started showing signs of failure we cleaned it, and it seemed OK for a
while. Then CEL came on and were still at it.

Al

hyundaitech

Contamination is typically the only thing that will "cause" an air flow
sensor to fail. If it isn't the CEL that is the "sign of failure," what
are the signs of failure that make you think the air flow sensor is having
a problem?

Big Al

"hyundaitech" <notpublic@not.public.com> wrote in message
news:29f8923c5ae2426022fcc4010185fcdc@localhost.ta lkaboutautos.com...
> Contamination is typically the only thing that will "cause" an air flow
> sensor to fail. If it isn't the CEL that is the "sign of failure," what
> are the signs of failure that make you think the air flow sensor is having
> a problem?
>

Sorry. It sets the CEL and shows a P1128 code. If I reset it, comes back on
in a day or two.

Al

hyundaitech

While the air flow sensor is the leading cause of this code, it's important
to check to make sure you don't have any vacuum leaks and that there are no
leaks between the air flow sensor and the throttle body.

The P1128 code simply means that the ECM has to hold the injectors open
longer than it thinks it should to achieve proper mixture. Possible
causes would be:
1. Vacuum leak (especially in PCV hose)
2. Air bellows not secure on air flow sensor or throttle body
3. Air bellows broken or otherwise leaking
4. Improper oxygen sensor readings
5. Low fuel pressure (very rare)'
6. Improper air flow sensor readings.

If you haven't been there yet, there's a very nice TSB you can view at
www.hmaservice.com which gives air flow readings that relate to engine rpm
and tps values. I'd recommend looking at it if you haven't already done
so. It's TSB # 01-36-022.

If you do indeed have another air flow sensor problem, then, like I said
previously, I'd suspect some sort of contamination issue. Perhaps even
excessive engine oil entering the bellows from the breather hose and
running down onto the sensor element.

Big Al

"hyundaitech" <notpublic@not.public.com> wrote in message
news:8ec8f97150b6e2e2b0d584228b6a2ffc@localhost.ta lkaboutautos.com...
> While the air flow sensor is the leading cause of this code, it's
important
> to check to make sure you don't have any vacuum leaks and that there are
no
> leaks between the air flow sensor and the throttle body.
>
> The P1128 code simply means that the ECM has to hold the injectors open
> longer than it thinks it should to achieve proper mixture. Possible
> causes would be:
> 1. Vacuum leak (especially in PCV hose)
> 2. Air bellows not secure on air flow sensor or throttle body
> 3. Air bellows broken or otherwise leaking
> 4. Improper oxygen sensor readings
> 5. Low fuel pressure (very rare)'
> 6. Improper air flow sensor readings.
>
> If you haven't been there yet, there's a very nice TSB you can view at
> www.hmaservice.com which gives air flow readings that relate to engine rpm
> and tps values. I'd recommend looking at it if you haven't already done
> so. It's TSB # 01-36-022.
>
> If you do indeed have another air flow sensor problem, then, like I said
> previously, I'd suspect some sort of contamination issue. Perhaps even
> excessive engine oil entering the bellows from the breather hose and
> running down onto the sensor element.
>

Thanks for the help. I'll start looking.

Al