Error Codes... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-28-2006, 10:16 PM   #1
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Default Error Codes...

DTC P0134 HO2S Circuit Insufficient Activity Sensor 1
DTC P0135 HO2S Heater Performance Sensor 1
DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

I take it the first two are are just me in need of a new O2 sensor. Whats the deal with the EGR, and how do I fix it?

BTW...I got an Aeroforce...pics later...I'm cold from installing it.
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Old 11-28-2006, 11:30 PM   #2
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You can try cleaning it and your electrical connections (battery,cables,grounds...) and see if it goes away.

On another note that I don't quite understand, why would you pick up an aeroforce before an O2 sensor that'* probably killing your mileage and costing you $$$$ ?
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Old 11-28-2006, 11:42 PM   #3
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Quote:
Originally Posted by popatim
On another note that I don't quite understand, why would you pick up an aeroforce before an O2 sensor that'* probably killing your mileage and costing you $$$$ ?
cuz the aeroforce probably just told him that he needs an o2
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Old 11-29-2006, 01:40 AM   #4
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Quote:
Originally Posted by harofreak00
Quote:
Originally Posted by popatim
On another note that I don't quite understand, why would you pick up an aeroforce before an O2 sensor that'* probably killing your mileage and costing you $$$$ ?
cuz the aeroforce probably just told him that he needs an o2
The SES light is part of the reason I got the aeroforce. I wanted a scan tool anyway.
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Old 11-29-2006, 07:35 AM   #5
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Cap...first thing I'd do is follow the FSM diagnostic procedure for those codes.

Simply dropping an O2 on may not fix the actual problem. I've found this to be very true when someone gets a car scanned etc. The guy at the autoparts store (in our scenario...we'll call him Andrew ) says.."oh.. the code says O2 in it..this means you need an O2"

This is not always the case. Following the FSM diagnostics will point you to diagnose if the problem truly is an O2 or a bare wire etc..
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Old 11-29-2006, 02:27 PM   #6
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Well...I don't have the 1996 FSM yet unfortunatly. What is the procedure for diagnosing it? With the aeroforce I can read O2 values etc. if that helps.

However, I have put about 20,000km on the car since I got it and I have no idea if the O2 was ever replaced anyway, so I was just planning on doing it sooner or later as it is probably overdue.

I got another different O2 code last night. It is throwing codes like crazy. I havn't got the EGR code back yet.

DTC P1133 HO2S Insufficient Switching Sensor 1
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Old 11-29-2006, 02:30 PM   #7
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Ok..insufficient switching is a good one for replacing and checking the O2.

Watch your aeroforce for mV on the bank 1 O2. If it moves quickly from 100/300 to 700/900 then you are good..if it'* slow or doesn't move. Time to replace.
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Old 11-30-2006, 04:08 PM   #8
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It is slow, and doesn't move much at all...so my new O2 is in the mail.

However, I got the EGR code again. I take it this is also a sensor problem? Where is it located?
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Old 11-30-2006, 04:54 PM   #9
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Quote:
Originally Posted by captainmiller
It is slow, and doesn't move much at all...so my new O2 is in the mail.

However, I got the EGR code again. I take it this is also a sensor problem? Where is it located?
the EGR on the Series 2 SC is on the back of the motor right behind the TB....

Here is a Pic
Name:  L36EGR.jpg
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it is the round cylinder with the connector at the top

although this is a S2 NA its the in the same place as your car
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