1999 HONDA CIVIC HO2S

Bt6A2, Dl6Y8 engines:
a. Disconnect the primary HO2S connector then
remove the primary HO2S.
816A2 engine
D16Y8 engine
PRIMARYH02S CONNECTOR
PRIMARY HO2S44 N.m {4.5 kgt'm.33 lbf'ft)
L
2. Install the primary HO2S in reverse order of removal'
Secondsry H02S:
1. Remove the secondary HO2S
Dl6Y5, Dt6Y7 engines:
a. Disconnect the secondary HO2S connector.
then remove the secondary HO2S'
02 SENSOR
816A2, Dt6Y8 ongin6s:
a. Remove the grommet, and pull out the secondary
HO2S connector, then disconnect the secondary
HO25 connector'
SECONOARY H()2S
CONNECTOR
{cont'd)
9-13

HO2S
Replacement (cont'd)
b, Remove the secondarv HO2S.
02 SENSOR WRENCH
SECONOARY HO2S4,r N.m (4.5 kgf.m, 33 tbf.ft)
Install the secondary HO2S in reverse order ofremovat.
9-14
wa

Gomponent Locations
L
lndex
D16Y5 engine:
{IATISENSORTroubleshooting,
ELECTRICAL LOADDETECTOR IELD) (USA mod6l)Troubleshooting, page 11 179
THROTTLE POSITION ITP)SENSORTroubleshooting, page 1 1-132
MANIFOLD ABSOLUTEPRESSURE IMAPI SENSORTroubleshooting, page 1'l-115
EXHAUST GAS RECIRCULATION
IEGRI VALVE and EXHAUST GAS
RECIRCULATION IEGRI VALVE
LIFT SENSORTroubleshooting, page'l 1-254
INTAKE AIR TEMPERATUR€
IDLE AIR CONTROL (IAC) VALVE
{M/T)Troubleshooting, page 1 1-194
EXHAUST GAS RECIRCULATION{EGRI CONTROL SOLENOIDVALVE ICW)Troubleshooting. page 1 1-254
EVAPORATIVE EMISSIONIEVAPI PUNGE CONTROLSOLENOID VALVETroubf eshooting, Page 1 1'21 1, 243
CRANKSHAFTPOS|TTON/TOP DEAD CENTER/CYLINDERPOS|T|ON
POWER STEERING PRESSURE(PSP) SWITCH (USAI
Troubleshooting, Page 1 1-212
KNoCK SENSoR (Ks)
(cwl
Troubleshooting, Page 1 1'170ICKP/TDC/CYP} SENSOR(Built into the distributor)Troubleshooting, Page 1 1'172
VEHICLE SPEED SENSORTroubleshooting, Page 1 1-176
FLUCTUATION (CKF} SENSOR
Troubleshooting, Page 1 1 -183
ENGINE COOLANTTEMPERATUREIECT) SENSORTroubleshooting, Page 11 128
IDT.ECONTROL IIACI VALVE
{cw)Troubleshooting, Page 11 198
WAY CATALYTICCONVERTER ITWCITroubleshooting, Page 1 1-252PRIMARY TIEATEDSENSOR {PNIMARY HO2SI
tsENsoR 1t {M/TlTroubleshooting, Page'l 1-146
PRIMARY HEATED OXYGENSENSOR (PRIMARY HO2SI
tsENsoR 1l {cw}Troubleshooting, Page 1 1-139
SECONDARY HEATED OXYGENSENSOR {SECONDARY HO2S){SENSOR 2)Troubleshooting, page 11 153
(cont'd)
1 1-3

Component Locations
Index (cont'd)
D16Y8 enginc:
THROTTLE POSITION {TPISENSORTroubleshooting, page 1 1-132
ELECTRICAL LOADDETECTOR IELDI {USAI
INTAKE AIR TEMPERATUREIIATISENSORTroubleshooting, page 1 1,124
MANIFOLO ABSOLUTEPRESSURE {MAPI SENSORTroubleshooting, page 1 1-1 15
IDI.E{A/T)
IDI.E AIR CONTROL IIACI VALVElMtflTroubleshooting, page 1 1-194
Troubleshooting, page 1 1-179EVAPORATIVE EMISSIONIEVAPI PURGE CONTROLSOLENOIO VALVETroubleshooting, page 1 1 27 1. 283CRANKSHAFTPOSTTTON/TOP DEAD CENTER/CYLINDERPOStTtON
POWER STEERING PRESSURE(PSPI SWTTCH |USA)Troubleshooting, page 1 1-212{CKP/TI'C/CYPI SENSOR(Built into the distributor)Troubleshooting. page 1 1-172KNOCK SENSOR IKSITroubleshooting, page 11 170
CRANKSHAFT SPEEDFLUCTUANON ICKFI SENSORTroubleshooting, page 1 1,183
CONTROL {IACI VALVE
ENGINE COOLANTTEMPERATURE{ECTI SENSORTroubleshooting, page 11 128
Troubleshooting, page 11 198
PRIMARY HEATED OXYGEN SENSOR{PRIMARY HO2S} (SENSOR 1l {'96 - 98 modolslTroubleshooting, page 1 1-139
'9!t - 00 modols:'96 - 98 modols:
THREE WAY CATALYNCCONVERTER ITWCITroubl6shooting, page 1 1-252
THREE WAY CATALYNCCONVERTER ITWCITroubleshooting. page 1 1-252
SECONDARY HEATED OXYGENSENSOn(SECONDARY HO2SI (SENSOR 2ITroubleshooting, page 1 1-153
SECONDARY HEATED OXYGENSENSOBISECONDARY HO2S} ISENSOR 2ITroubloshooting, page 1 1-155
PRIMARY HEATEO OXYGEN SENSORIPRIMARY HO2SI ISENSOR 1ITroubleshooting, page 1 1-141
11-4

D16Y7 engine:
ELECTRICAL LOAO
DETECTOR (ELD) IUSA}Troubleshooting, Page 11'179
THROTTLE POSITION ITPISENSOR
MANIFOLD ABSOLUTEPRESSURE (MAPI SENSORTroubleshooting, Page 1 1-1 15r1-132
CRANKSHAFTPOSTTTON/TOP DEAD CENTER/
CYLINDERPOSITION
POWER STEERll\lG PRESSURE
{PSP' SWTTCH {USA)Troubleshooting, Page 11 212
IDLE AIR CONTROL (IAC) VALVE
Troubleshooting, page 1 1-198
Troubleshooting,
VEHICLE SPEED SENSOR (VSSI
Troubleshooting, Page 1 1-176
INTAKE AIR TEMPERATURE
IIATI SENSORTroubleshooting, page 11 124
l
/i
CRANKSHAFT SPEED
{CKP/TDC/CYPI SENSOR(Built into the distributorlTroubleshooting, Page 't 1-172
FLUCTUATION ICKFI SENSORTroubleshooting, Page 1 1-183
PRIMARY HEATED OXYGEN
SENSOR (PRIMARV HO2S)
{SENSOR 1lTroubleshooting, page 1 1'139
ENGINE COOLANTTEMPERATURE(ECTI SENSORTroubleshooting, page 11 128
EVAPOBATIVE EMISSION(EVAPI PURGE CONTROLSOLENOID VALVE
THNEE WAY CATALYTICCONVERTER ITWCITroubleshooting, page 1 1-252
Troubf eshooting, page 1 1 27 1, 283
SECONDARY HEATED OXYGENSENSOR (SECONDARY HO2S)(SENSOR 2lTroubleshooting, Page 1 1-1 53
(cont'd)
,l .ltr| | -r,

Component Locations
Index (cont'dl
Bl6A2 engine:
INTAKE AIR TEMPERATURE{IAT} SENSORTroubleshooting, page 1'1-125
MANIFOLO AESOLUTEPRESSURE IMAPI SENSORTroubleshooting. page 11-1 19IOLE AIR CONTROL {IAC) VALVETroubleshooting, page 1 1,196
ELECTRICAL LOADDETECTOR IELDI (USA)
Troubleshooting, page 1 1-180
THROTTLE POSITION ITPISENSORTroubleshooting, page 11-134
CRANKSHAfiPOStTtON/TOP DEAD CENTER/CYLINDERPOStTtON{CKP/TDC/CYPI SENSOR(Bualt into the distributor)Troubleshooting,page 11-174
POWER STEERING PRESSURE{PSPI SWTTCH (USA)
Troubleshooting, page 1 1-214
VEHICLE SPEED SENSOR {VSS}Troubleshooting, page 1 1-177
ENGINE
CRANKSHAFT SPEEDFLUCTUATION (CKFI SENSORTroubleshooting, page 11- t85TEMPERATUREIECTI SENSORTroubleshooting, page I 1-128
THREE WAY CATALYTICCONVERTER ITWC)Troubleshooting, page 1 1,252
S€CONOARY HEATED OXYGENsf rlsoR
sfCoNDARY HO2SI {SENSOR 2): ?shootrng, page 11 155
-6
PRIMARY HEATED OXYGEN SENSORIPRIMARY HO2S) ISENSOR 1ITroubleshooting, page 1 1-141
11

Dl6Y5 engine ('96 - 97 modelsl:
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,6i
@
o@€)@o
@(il(i'
PRIMARY HEATED OXYGEN SENSOR {PRIMARY HO2S,
SENSOR 1'SECONDARY HEATED OXYGEN SENSOR (SECONDARY
HO2S. SENSOR 2l
MANIFOLD ABSOLUTE PRESSURE {MAP) SENSOR
ENGINE COOLANT TEMPERATURE (ECTI SENSOR
INTAKE AIR TEMPERATURE IIAT) SENSOR
KNOCK SENSOR (KS)
CRANKSHAFT SPEED FLUCTUATTON (CKF} SENSOR
IOLE AIR CONTROL (IAC} VALVE
THROTTLE BODY (TBI
FUEL INJECTORFUEL PULSATION DAMPER
FUEL FILTERFUEL PRESSURE REGULATORFUEL PUMP IFPIFUEL TANK
:li Vacuum hose No*: CVT only
FUEL TANK EVAPORATIVE EMISSTON {EVAP) VALVE
AIR CLEANERRESONATORPOSITIVE CRANKCASE VENTIL/ATION IPCVI VALVE
EXHAUST GAS RECIRCULATION IEGR) CONTROL
SOLENOID VALVEEXHAUST GAS RECIRCULATION (EGRI VALVE
EXHAUST GAS RECTRCULATION IEGRI VALVE LIFT
SENSOREVAPORATIVE EMISSION IEVAPI PURGE CONTROL
SOLENOID VALVEEVAPORATIVE EMISSION {EVAP} CONTROL CANISTER
EVAPORATIVE EMISSION {EVAP} TWO WAY VALVE
THREE WAY CATALYTIC CONVERTER (TWCI
{Do(D
@@
@@
@
@@@
(cont'd)
1 1-19
!'a

System Description
Vacuum Connections (cont'd)
D16Y5 engine ('98 modet):
-: Vacuum hose No,*: CW only
(9 POSITIVE CRANKCASE VENTILATION {PCV} VALVE?!J EXHAUST GAS BECIRCULATION (EGR}CONTROLSOLENOIO VALVE'1 ExHAUST GAs RECIRCULATIoN IEGRI VALVE22 EXHAUST GAS RECIRCULATION {EGR} VALVE LIFISENSOR€J EvApoRATtvE EMtsstoN {EvAp} puRGE coNTRoLSOLENOID VALVEq4 PURGE JOINT@ EVAPoRATIVE EMIssIoN {EVAP) coNTRoL CANISTER@ EVAPORATIVE EMISSION IEVAP} BYPASS SOLENOIDVALVE?? EVAPORATIVE EMISSION {EVAP) THREE WAY VALVEITII EVAPORATIVE EMISSION IEVAP} CONTROL CANISTERVENT SHUT VALVEO FUEL TANK PRESSURE sENsoRQlI EVAPORATIVE EMISSION {EVAP}TWO WAY VALVE8' THREE WAY CATALYTIC CONVERTER {TWCI
il) PRIMAFY HEATED OXYGEN SENSOR IPRIMARY HO2S.SENSOR 1)O SECoNDARY HEATEo oxYGEN sENsoR {sEcoNDARYHO2S. SENSOB 2)iq] MANIFOLD ABSOLUTE PRESSURE (MAPI SENSORO ENGINE COOLANT TEMPERATURE IECT) SENSOR5 INTAKE AIR TEMPERATURE {IATI SENSOR! KNOCK SENSOR tKSlO CRANKSHAFT SPEED FLUCTUATIoN {cKF) sENsoFO IDLE AIR coNTRoL {IAc) vALvE99 THROTTLE BODY ITBI@ FUEL INJECToRO FUEL PULSATION DAMPER@ FUEL F -TER@ FUEL PRESSURE REGULAToR[4 FUEL PUMP IFPI(9 FUEL TANK(D FUEL TANK EVAPoRATIVE EMIssIoN IEVAPI VALVEO' AIR CLEANER(D RESoNAToR
11-20