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PGM-FI System
Primary,Heated Oxygen Sensor (HO2S) (Sensor 1) (cont'dl
The scan tool indicates Diagnostic Trouble Code (DTC) P0133: A slow response problem in the Primary
Heated Oxygen Sensor (HO25) (Sensor 1) circuit.
Description
By controlling the airlfuel ratio with a Primary HO2S (Sensor
'l) and a Secondary HO2S (Sensor 2), the deterioration of the
primary HO2S {Sensor 1) can be evaluated by its teedback period. When the feedback period of the HO2S exceeds a cer-
lain value during stable driving conditions, the sensor will be judged as deteriorated.
When deterioration has been detected during two consecutive trips, the MIL comes on and DTC P0133 will be stored
NOTE: ll DTC P013't, P0132 and/or P0'135 are stored at the same time as DTC P0133, troubleshoot those DTCS first, then
troubleshoot DTC P0133.
Possible Cause
. Primary HO2S (sensor 1) Deterioration
o Primary HO2S Heater (sensor 1) Deterioration
. Exhaust system leakage
Troubl€shooting Flowchart
')
lit
ll r
-
Tho MIL has boon raDortcd on.
-
DTC P0133 is storcd.
Problem verificttion:
1. Do the ECM Reset Procedure.
2 . S t a r t t h e e n g i n e . H o l d t h o
engine at 3,000 rpm with no
load (in Park or neutral) until
the radiator fan comes on.
3. Connect the SCS service con-
4 . T e s t ' d r i v e L r n d e r f o l l o w i n g
conditions.
*
55 mph (89 km/h) steady
speed
-
NT in E position, M/T in
5th gear
-
Until readiness code com€s
o n
lnt.flnittcnt
ftilu... ay3tam ia OK
at thb tiinr. Ch.ck fo. poor con-
necliona o. looaa wita! al Cll3
lPrim.ry HO2S lscn.or lll
lnd
ECM.
ls DTC P0133 indicated?
Roplacs the Primary HO2S lscn-
3or 1),
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Troubleshooting
