Description

Bosch 33, 75, 90, 147, 156 Technical Manual

I’ve been turning wrenches for 28 years, and I’ve seen more aftermarket cross-reference charts than I care to remember. Most of them are wrong. If you’re hunting down a Bosch oxygen sensor, fuel pump, or MAP sensor for an Alfa Romeo 33, 75, 90, 147, or 156, you need the actual factory documentation – not some third-party guess. This Bosch 33, 75, 90, 147, 156 Technical Manual is the OEM component application index that lists exactly which Bosch part goes on which vehicle, by build date, engine code, and system type. 156 pages of data you can trust.

Vehicle Listing Index – Where the Manual Starts

Page 1 hits you with the Vehicle Listing Index and the “How to Use This Catalogue” section. Bosch designed this thing with a blue highlighting system to flag differences between models. Miss that detail, and you’ll order the wrong fuel filter. The index covers Alfa Romeo, Audi, Bentley, BMW, and a dozen other makes. But the meat for you is the Alfa lineup: 33, 75, 90, 147, 156, plus 164, 166, GTV, Montreal, and Spyder. Each entry shows production date ranges, engine type codes (like AR30588 or AR32310), management system (L-Jetronic, Motronic, Direct Injection), and component ratings.

How Do You Use This Catalogue?

Flip to page 1 and read the instructions. I know, nobody reads instructions. But Bosch uses a consistent format: vehicle model name, build date, engine code, series/type, body/cylinders, displacement, management system, and a comments column for chassis numbers or special notes. For example, under Alfa Romeo 75 you’ll find the 2.0L Twin Spark with Motronic ML 4.1 from 01.87 to 02.92, and the V6 2.5L and 3.0L variants. The blue highlighting calls out differences like engine code changes. If you skip that, you’re guessing. And guessing costs you time and money.

Alfa Romeo 33, 75, 90, 147, 156 – What the Manual Covers

Page 3 lists the Alfa Romeo section in full. For the 33, it covers the 1.7L from 10.87 to 12.89 with L-Jetronic, and the 16v version from 01.90 to 10.94 with Motronic. The 75 gets three variants: 2.0L Twin Spark, 2.5L V6, and 3.0L V6. The 90 appears with two V6 2.5L entries – one from 10.84, another from 02.86. The 147 lists the 2.0L from 11.00 to 06.03 with Motronic ME 7.3.1. And the 156 gets four rows: 2.0L with Motronic M 1.5/ME 3.1, 2.0L JTS Direct Injection, 2.5L V6, and 3.2L V6. That’s the kind of detail you need when a customer rolls in with a misfire and you’ve got to ID the correct ECU or sensor.

Which Engine Management Systems Are Listed?

The manual covers L-Jetronic, Motronic (ML 4.1, M 1.5, ME 2.1, ME 3.1, ME 7.3.1), and Direct Injection for the JTS engine. For each system, it lists the Bosch component ratings – for example, under Alfa 156 V6 2.5L you see Motronic ME 2.1 with rating D36. That rating code ties back to Bosch’s internal part numbering for oxygen sensors, fuel pumps, and engine speed sensors. You can cross-reference the rating code to find the exact Bosch part number from other sections of the catalogue. That’s why this manual is worth having on your bench.

Why Factory Bosch Documentation Matters

I’ve seen aftermarket guides that list “universal” oxygen sensors for a 1989 Alfa 75. They’re wrong. Bosch changed the sensor design in late 1987. This manual gives you the production date cutoffs and the exact Bosch part number. No guesswork. For later applications, check the Bosch 147, 156, 159, 166, 2400 2011 Technical Manual | Shop Specs”>Bosch 147, 156, 159, 166, 2400 2011 Technical Manual | Shop Specs for expanded coverage. If you need hydraulic specs, the Bosch NG6, NG10 Technical Manual – 204 Pages of Factory Hydraulic Specs”>Bosch NG6, NG10 Technical Manual – 204 Pages of Factory Hydraulic Specs has those. And for diagnostic tooling, grab the Bosch KTS 550 2004 Technical Manual – Factory Specs”>Bosch KTS 550 2004 Technical Manual – Factory Specs.

Working on a manual transmission? This index tells you which Bosch speed sensor (0 261 210 048, for example) fits a given model year. Look up Manual Transmission”>Manual Transmission applications in the vehicle component section – you’ll find entries for BMW 3-series and Audi with exact part numbers. Another pass through the index for Manual Transmission”>Manual Transmission models confirms the same data for Alfa GTV and Spyder. That’s the kind of cross-referencing you can only do with an OEM source.

Frequently Asked Questions

Does this manual include torque specs?

No. This is a component application catalogue, not a repair manual.

Can I use this index to find Bosch parts for non-Alfa vehicles?

Absolutely. The manual covers Audi, Bentley, BMW, and many other manufacturers with the same level of detail. For example, under BMW you’ll find 3.0 CSi, 3-series E21/E30/E36/E46, and 5-series E12/E28/E34/E39 entries. Each listing includes the Bosch management system, component rating, and production dates. Use the blue highlighting to spot differences between engine variants. This is the same data Bosch dealers used to identify parts before online catalogues existed. If you’re restoring a 1986 Alfa 90 or a 1992 Audi 100, this manual will give you the correct Bosch part number for the fuel pump, oxygen sensor, MAP sensor, or coolant temp sensor. Cross-reference the rating code (D35, D36, D37, etc.) with the Bosch master parts list to get the exact replacement. It’s tedious, but it’s accurate.

If you’re tired of returning the wrong parts because some website said “fits all models,” get this OEM manual on your hard drive. Access the Factory Manual and start matching components by build date and engine code like a pro.