Toyota Corolla trouble codes - Toyota Nation Forum : Toyota Car and Truck Forums

maximayor · 08-31-2011, 01:58 AM

I just had my car scanned because the check engine light has been on and it came up with the following codes:

P0171 System Too Lean Bank 1
P0101 Mass or Volume Air Flow A Circuit Range / Performance
P0102 Mass or Volume Air Flow A Circuit Low
P0113 Intake Air Temperature Sensor 1 Circuit High
P0133 O2 Sensor Circuit Slow Response Bank 1 Sensor 1
P0134 O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1
P2195 O2 Sensor Signal Biased / Stuck Lean Bank 1 Sensor 1

Any suggestions to likely trouble areas before I take it to the mechanic?

Thanks

invader · 08-31-2011, 03:16 AM

What year is it, and was your ECM already replaced?

maximayor · 08-31-2011, 04:16 AM

It is a toyota corolla 2004. I'm not sure if the ECM has been replaced. I bought it used at about 100k miles

invader · 08-31-2011, 04:21 AM

Your 2004's original ECM should be ok then. Have you replaced your leaking intake manifold gasket for the revised one yet, to start with? What's your mileage now?

maximayor · 08-31-2011, 04:28 AM

The current mileage is 107k miles. I am yet to replace the intake manifold gasket. Should I start with that?

invader · 08-31-2011, 04:54 AM

Absolutely. Get the revised Toyota gasket. You can then reset the ECM by removing the blue 15A EFI fuse in the underhood fuse panel, or by removing the battery to be safe before removing intake manifold which sits above live starter and alternator cables/connectors. No need to drain coolant, as you can set the throttle body aside (and clean it) without unhooking its coolant lines.
You could also remove and clean the IAT/MAF sensor on the intake, with electrical or brake cleaner spray, and wipe the exposed IAT sensor head.

maximayor · 08-31-2011, 05:05 AM

Thanks a lot. Will provide feedback as soon as this is done. It's difficult getting authentic parts here though. Hopefully, I will let you know how it turns out by the weekend.
Thanks again

maximayor · 08-31-2011, 11:42 AM

I am yet to replace the intake manifold gasket as I have been unable to locate a seller yet. I will try tomorrow. I cleaned the MAF sensor and cleared the codes. I drove the car for about 20 miles. I noticed improvements in how the car accelerates.
The only code showing up now is P0134 O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1.

Quote:

DTCFRZF P0134
FUELSYS1 OL
FUELSYS2 N/A
LOAD_PCT(%) 27.1
ETC(¡æ) 87
SHRTFT1(%) 19.5
LONGFT1(%) -19.5
RPM(/min) 1813
VSS(km/h) 78
IAT(¡æ) 29

invader · 08-31-2011, 05:55 PM

Sounds like you need to replace the primary O2 sensor on exhaust manifold too, beside the intake manifold gasket... Its signal output is abnormaly stable.

maximayor · 08-31-2011, 09:42 PM

Thanks. I will let you know how it goes