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1999 Porsche Boxster 986 Base Convertible H6 2.5L

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Your Vehicle 1999 Porsche Boxster 986 Base Convertible H6 2.5L
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1999 Porsche Boxster 986 Base Convertible H6 2.5L Engine Emission Parts

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Oxygen Sensor - Priced Each

ES#2602695 - 98660612601 - Oxygen Sensor - Priced Each - Fitment both before and after the catalyst - 4 required - Bosch - Porsche

Fitment both before and after the catalyst - 4 required 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Bosch - Corporate Logo
ES#:
2602695
Mfg#:
98660612601
In Stock at Vendor
$120.34

This product was last offered at the strikethrough price on
02-21-2026

$95.54 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Air Check Valve

ES#1476641 - 99311325003 - Air Check Valve - Valve for secondary air injection - Genuine Porsche - Porsche

Valve for secondary air injection

Brand:
Genuine Porsche - Corporate Logo
ES#:
1476641
Mfg#:
99311325003
In Stock at Vendor
$225.99

This product was last offered at the strikethrough price on
02-14-2026

$173.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Crankcase Vent Valve

ES#1483491 - 99610704751 - Crankcase Vent Valve - Connection piece for oil separator vent line - Genuine Porsche - Porsche

Connection piece for oil separator vent line

Brand:
Genuine Porsche - Corporate Logo
ES#:
1483491
Mfg#:
99610704751
In Stock
Limited Qty Sale
$48.99

This product was last offered at the strikethrough price on
05-02-2026

$43.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Crankcase Breather Hose

Connects the crankcase breather valve to the air-oil separator We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
4699215
Mfg#:
99610714755
Ships in 1 Business Day
$101.99 USD
Free Shipping
on orders $49 and up

Oil Separator

ES#3181574 - 99610702304H - Oil Separator - Oil vapor separator - Hudson - Porsche

Oil vapor separator

Brand:
Hudson - Corporate Logo
ES#:
3181574
Mfg#:
99610702304H
Ships in 1 day
$97.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Air-Oil Separator

ES#2816623 - 99610702304 - Air-Oil Separator - Keep your crankcase pressures and emissions down with a new separator - Hamburg Tech - Porsche

Keep your crankcase pressures and emissions down with a new separator We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2816623
Mfg#:
99610702304
Ships in 1 Business Day
$89.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Vapor Canister Purge Valve

ES#4759306 - 99660521301 - Vapor Canister Purge Valve - Carbon canister one-way valve - URO - Porsche

Carbon canister one-way valve 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
4759306
Mfg#:
99660521301
Ships in 1 Business Day
$89.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Vacuum Reservoir

ES#4266844 - 0PB129093 - Vacuum Reservoir - Keeps vacuum-operated accessories functioning properly - Genuine Porsche - Porsche

Keeps vacuum-operated accessories functioning properly

Brand:
Genuine Porsche - Corporate Logo
ES#:
4266844
Mfg#:
0PB129093
Ships in 4 Business Days
$76.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Dual Drive Oxygen Sensor Wrench

ES#2944218 - LIS12390 - Dual Drive Oxygen Sensor Wrench - Tool comes with both 1/2" and 3/8" drive. - Lisle - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Tool comes with both 1/2" and 3/8" drive.

Brand:
Lisle - Corporate Logo
ES#:
2944218
Mfg#:
LIS12390
Ships in 6 Business Days
$59.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oil Separator Gasket

ES#1482673 - 99610124151 - Oil Separator Gasket - Internal oil separator gasket for bank two (cylinders 4-6) - Genuine Porsche - Porsche

Internal oil separator gasket for bank two (cylinders 4-6)

Brand:
Genuine Porsche - Corporate Logo
ES#:
1482673
Mfg#:
99610124151
Ships in 4 Business Days
$59.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oil Separator Gasket

ES#1482674 - 99610124251 - Oil Separator Gasket - Internal oil separator gasket for bank one (cylinders 1-3) - Genuine Porsche - Porsche

Internal oil separator gasket for bank one (cylinders 1-3)

Brand:
Genuine Porsche - Corporate Logo
ES#:
1482674
Mfg#:
99610124251
Ships in 4 Business Days
$59.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Hose Pinchers

ES#2944378 - LIS22850 - Hose Pinchers - A must for any car enthusiast. - Lisle - Audi BMW Volkswagen Mercedes Benz MINI Porsche

A must for any car enthusiast.

Brand:
Lisle - Corporate Logo
ES#:
2944378
Mfg#:
LIS22850
Ships in 1 Business Day
$17.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Fuel Filler Gas Cap

ES#2748874 - 99620124103 - Fuel Filler Gas Cap - Fuel tank cap with tether - Rein - Porsche

Fuel tank cap with tether 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
2748874
Mfg#:
99620124103
Ships in 1 Business Day
$21.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Secondary Air Injection Check Valve

ES#2862524 - 96411095002 - Secondary Air Injection Check Valve - Replace your faulty check valve - Genuine Porsche - Porsche

Replace your faulty check valve

Brand:
Genuine Porsche - Corporate Logo
ES#:
2862524
Mfg#:
96411095002
Ships in 4 Business Days
$39.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Universal Catch Can Drain Kit

ES#3543138 - 20-0024 - Universal Catch Can Drain Kit - Intuitive drain solution for most catch can applications - Radium Engineering - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Intuitive drain solution for most catch can applications

Brand:
Radium Engineering - Corporate Logo
ES#:
3543138
Mfg#:
20-0024
In Stock at Vendor
$28.99 USD
Free Shipping
on orders $49 and up

Secondary Air Injection Check Valve

Replace your faulty check valve

Brand:
Pierburg - Corporate Logo
ES#:
4487871
Mfg#:
96411095002
In Stock at Vendor
$29.99

This product was last offered at the strikethrough price on
05-07-2026

$25.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Emission Parts

Repairing failed emission components doesn't just turn off the check engine light so you can pass your local emissions test, it also improves performance and fuel economy. ECS stocks all common emission controls, from oxygen sensors to PCV valves.

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Manufacturer names and/or part numbers are used only for identification purposes.

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